The party soon joined the centre-right Solidarity Electoral Action coalition and was subsequently part of it in the 1997 parliamentary election.

The coalition won 33.8% of the vote and 201 seats in the Sejm, 14 of which were SKL members, notably including Rokita and Bronislaw Komorowski.

In the 2000 presidential election, Marian Krzaklewski was the coalition's official candidate and won 15.6% of the vote, but a large chunk of the coalition, especially SKL members, had supported the independent candidate Andrzej Olechowski,[2] who won 17.3% of the vote.

However, in March 2001, the SKL withdrew from the coalition and most of it would later join, indirectly or directly, Civic Platform, which had been established in January 2001.

In 2002, what remained of the SKL was merged with the Polish Christian Democratic Agreement, while Rokita was Civic Platform's leader in the Sejm from 2003 to 2005.