Second Cabinet

On 17 May 1923, an agreement was held in Warsaw between the Polish centre (Polish People's Party "Piast") and right-wing parties (primarily Związek Ludowo-Narodowy and Polskie Stronnictwo Chrześcijańskiej Demokracji and several smaller parties, known as the Christian Union of National Unity alliance or Chjena) called the Lanckorona Pact (Polish: Pakt lanckoroński). The politicians of those parties agreed to pursue stricter polonization policies and to increase the role of Catholic Church in the state. Furthermore, the program of Polonization of the Eastern Borderlands was to be initiated. The pact was signed at Warsaw's apartment of Juliusz Zdanowski, one of the leaders of Zwiazek Ludowo-Narodowy. Its name refers to the fact, that it was negotiated in the real estate of Senator Ludwik Hammerling, who was elected in the district which included Lanckorona. The agreement led to the dismissal of the government of Władysław Sikorski and creation of the Chjeno-Piast coalition on 28 May, with the new government of Witos. Former Polish chief of state, Józef Piłsudski, who resigned claiming that he would not participate in the government, which is made of parties responsible for the death of President Narutowicz.

He resigned in December 1923.

Third Cabinet and Coup d'état

In November 1925, the government of Prime Minister Władysław Grabski was replaced by the government led by Minister of Foreign Affairs Aleksander Skrzyński, which had received support from the National Democrats and the Polish Socialist Party. General Lucjan Żeligowski became the new government's minister of military affairs. However, after the PPS withdrew its support, this government also fell and was replaced by that of Witos, formed by the Polish People's Party "Piast" and the Christian Union of National Unity (Chjeno-Piast). However, the new government had even less popular support than the previous ones, and pronouncements from Józef Piłsudski, who viewed the constant power shifts in the Sejm as chaotic and damaging, set the stage for a coup d'état. Apart from domestic turmoil, Polish politics had been shaken by a trade war with Germany, begun in June 1925, and by the signing of the Treaty of Locarno on 16 October. Under the terms of the treaty, the World War I western European Allied powers and the new states of Central and Eastern Europe sought to secure a postwar territorial settlement in return for normalized relations with defeated Germany. On 10 May 1926, a coalition government of Christian Democrats and Agrarians was formed, and that same day Józef Piłsudski, in an interview with Kurier Poranny (the Morning Courier), said that he was "ready to fight the evil" of sejmocracy and promised a "sanation" (restoration to health) of political life. The newspaper edition was confiscated by the authorities.

The night of 11 to 12 May, a state of alert was declared in the Warsaw military garrison, and some units marched to Rembertów, where they pledged their support to Piłsudski. On 12 May, they marched on Warsaw and captured bridges over the Wisła River. Meanwhile, Witos' government declared a state of emergency. At about 17:00 hours, Marshal Piłsudski met President Stanisław Wojciechowski on the Poniatowski Bridge. Major Marian Porwit who commanded one of the troops loyal to the government), reported to the president, then reported to Piłsudski and witnessed the discussion between the two dignitaries. Piłsudski demanded the resignation of Witos' cabinet, while the President demanded Piłsudski's capitulation. After the failure of negotiations and the president's departure, Major Porwit refused Piłsudski to let him cross the bridge. On 14 May, at about 13:00 hours, Witos' cabinet decided to move from the Belweder Palace to Wilanów. Wojciechowski allowed this decision an hour later. After transferring to Wilanów, Wojciechowski and Witos negotiated with the commanders of troops loyal to the cabinet. The military decided they should move to Poznań and maintain the armed struggle from beyond. Eventually, to prevent the Warsaw fighting from turning into a country-wide civil war, both Wojciechowski and Witos decided to resign and issued an order to their troops to cease fratricidal fighting. A new government was formed under Prime Minister Kazimierz Bartel, with Piłsudski as the new Minister of Military Affairs. On 31 May 1926, the National Assembly nominated Piłsudski to be president, but he declined. Eventually Ignacy Mościcki became the new president; Piłsudski, however, wielded much greater de facto power than his military ministry nominally gave him.

Centrolew

Witos in 1928

On 26 May 1926, Witos resigned as President of the Polish People's Party "Piast" shortly after his removal from power, though it was not adopted. He resigned in 1927 as President of the Małopolska Agricultural Society due to the limitation of state financial assistance. On 18 August 1927, the Krakow Provincial Office dissolved the Union of Commune Heads, which was created by Witos and operating in Lesser Poland under his own leadership. In the 1928 Polish legislative election, Witos successfully applied for parliamentary re-election as the member of the Sejm for the Tarnów district, by obtaining the largest number of votes for this constituency. On 9 April 1929, the Voivode of Kraków Voivodeship Mikołaj Kwaśniewski, removed Witos from the Tarnów local government board, to which he served as a member of this board since 1905. Witos remained in clear opposition during the Sanation regime.

From 1929–1930, Witos was one of the leaders of Centrolew (English: Centre-left), a coalition of several Polish political parties (Polish People's Party "Wyzwolenie", Polish People's Party "Piast", National Workers' Party, Polish Socialist Party and Christian-democratic parties). The coalition was directed against Piłsudski and the Sanation government. Witos participated, among others at the Congress of Defense of People's Rights and Freedom in Krakow (organized by Centrolew) in June 1930, during which he gave a speech.

Brest trials

The Polish Sanation government had invalidated the 1930 election results by disbanding the parliament in August and with increasing pressure on the opposition started a new campaign, the new elections being scheduled for November. Using anti-government demonstrations as a pretext, 20 members of the opposition, including most of the leaders of the Centrolew alliance (from Polish Socialist Party, Polish People's Party "Piast" and Polish People's Party "Wyzwolenie") were arrested in September without a warrant, only strictly on the order of Józef Piłsudski and the then Minister of Internal Security, Felicjan Sławoj Składkowski, accusing them of plotting an anti-government coup. The opposition members (who included Witos, and Wojciech Korfanty) were imprisoned in the Brest Fortress, where their trial took place (thus the popular name for the election: the 'Brest election'). The detainee (including Witos' inmates and opponents of the Sanation) were beaten and humiliated. Witos was ordered, among others manually cleaning latrines and emptying faeces buckets. A little later he was taken to the arrest in Grójec. On 27 November 1930 (the same day he was re-elected to the Sejm), Witos left prison, his bail was set at 10,000 zloty.

Regardless of Sanation's struggle against the well-known parties, Witos declared the need to consolidate with peasant groups. On 15 March 1931, he formed the "united" People's Party from the merger of three other, smaller, peasant-based parties: the Polish People's Party "Piast", Polish People's Party "Wyzwolenie" and left-wing Stronnictwo Chłopskie (SCh). On 26 October 1931, the Brest trial began in Warsaw. Witos and the other 10 accused were charged with the fact that in the period from 1928 to 9 September 1930, following the communicating between each other and acting consciously, they jointly prepared an assassination attempt whose purpose was to forcefully remove members of the Council of Ministers and replace them by other people, although without a fundamental change state system. None of the accused pleaded guilty after 55 hearings from the trial. Witos used the opportunity to explain the harsh criticisms of Sanation's actions, starting with the May Coup of 1926. Among others, Witos stated:

Your Honor, I was the president of this government that was overthrown by the May coup. So I wasn't plotting, I wasn't plotting, but I, along with the government, was the victim of a plot and assassination. This government was not a usurper government, it was a constitutional government, in a lawful manner, in a completely lawful manner appointed by the President of the Republic of Poland. Someone else was swinging, someone else was plotting, and I am sitting on the bench!

During the trial, Witos's lawyer was attorney Stanisław Szurlej. The accused were acquitted of the charge of preparing a coup d'état, though they were convicted of their activities. Witos was sentenced to 1/5 years in prison and deprived of public rights for 3 years. Witos was imposed a fine of PLN 80, similar to the fine imposed on Kazimierz Bagiński. The Brest trial ended in January 1932, with 10 accused receiving sentences up to three years of imprisonment; the appeals of 1933 confirmed the sentences. On 7–11 February 1933, an appeal hearing was held which culminated in the approval of the first-instance judgment. On 9 May, the Supreme Court cancelled this judgment and referred the case back to the court. On 11–20 July, a second hearing was held before the Court of Appeal which found the first judgment justified. The verdict was finally approved by the Supreme Court, which on 2–5 October, reconsidered the appeal of the defenders. Five of the convicts went to prison to serve their sentence. Witos, Adam Pragier, Wladyslaw Kiernik, Kazimierz Baginski and Herman Lieberman went into exile, before the approval of the judgment by the Supreme Court. They wrote in a joint statement:

We will not again be hostage to the dictatorship, as in 1930 ... The country demands from us not martyrdom, but a struggle to remove the mafia, which established its reign on lies, harm and depravity of characters. We left Poland to continue fighting the hated dictatorship.