On October 7, 1918, on initiative of Prince Lubomirski, Polish declaration of independence was announced.
Seven days later, first Polish Army soldiers pledged allegiance to the Polish flag.
Lubomirski himself regarded Józef Piłsudski as an excellent politician and statesman, and supported Pilsudski's nomination for the post of the head of state (see Naczelnik Panstwa).
On November 10, 1918, Lubomirski welcomed Pilsudski at Warsaw's Rail Station, and four days later, Pilsudski became the head of Polish state.

In the early 1920s Lubomirski stayed away from political life.
He decided to return to politics after the May Coup.
On May 13, 1926 he talked with Pilsudski at Warsaw East Rail Station.
Soon afterwards, he was among four men considered for the post of President of Poland, but refused to accept the nomination.
In 1928–1935, Lubomirski was a senator of Nonpartisan Bloc for Cooperation with the Government, and a chairman of two Senate commissions – foreign affairs and military.
He frequently participated in different international events, such as 1929 funeral of Marshal Ferdinand Foch.

In 1930, Lubomirski resigned from the Senate in protest against the Brest trials, but Prime Minister Walery Slawek did not accept the resignation.
Lubomirski disliked the so-called colonels’ regime, and in the late 1930s, he organized several secret meetings, in which political situation of the Second Polish Republic was discussed.
The sanacja government was aware of it, and blocked Lubomirski's run for Senate election in 1938.
Meanwhile, Lubomirski continued his charity activities, as member of several civic organizations.
On October 7, 1918, on initiative of Prince Lubomirski, Polish declaration of independence was announced. Seven days later, first Polish Army soldiers pledged allegiance to the Polish flag. Lubomirski himself regarded Józef Piłsudski as an excellent politician and statesman, and supported Pilsudski's nomination for the post of the head of state (see Naczelnik Panstwa). On November 10, 1918, Lubomirski welcomed Pilsudski at Warsaw's Rail Station, and four days later, Pilsudski became the head of Polish state.
In the early 1920s Lubomirski stayed away from political life. He decided to return to politics after the May Coup. On May 13, 1926 he talked with Pilsudski at Warsaw East Rail Station. Soon afterwards, he was among four men considered for the post of President of Poland, but refused to accept the nomination. In 1928–1935, Lubomirski was a senator of Nonpartisan Bloc for Cooperation with the Government, and a chairman of two Senate commissions – foreign affairs and military. He frequently participated in different international events, such as 1929 funeral of Marshal Ferdinand Foch.
In 1930, Lubomirski resigned from the Senate in protest against the Brest trials, but Prime Minister Walery Slawek did not accept the resignation. Lubomirski disliked the so-called colonels’ regime, and in the late 1930s, he organized several secret meetings, in which political situation of the Second Polish Republic was discussed. The sanacja government was aware of it, and blocked Lubomirski's run for Senate election in 1938. Meanwhile, Lubomirski continued his charity activities, as member of several civic organizations.
Zdzisław Lubomirski