Lady Gaga performs during a campaign rally with Democratic presidential nominee former Secretary of State Hillary Clinton at North Carolina State University on Nov. 8, 2016 in Raleigh, N.C.

They're petitioning the Electoral College electors to go against their states' votes.

Lady Gaga, Pink, Sia and other celebrities have lent their support to a campaign to legally prevent Donald Trump from assuming presidency and is encouraging their fans to do the same.

The effort is attached to a petition with more than 3.1 million signatures at publishing asking the electors of the Electoral College to reject how their states voted on Dec. 19 and instead vote for Hillary Clinton.

Gaga posted to Twitter, "If you feel scared about the current state of American politics and Whitehouse sign this petition."

The petition argues that "Mr. Trump is unfit to serve. His scapegoating of so many Americans, and his impulsivity, bullying, lying, admitted history of sexual assault, and utter lack of experience make him a danger to the Republic."

It argues that while Trump won the electoral vote, Clinton's expected victory of the popular vote by more than 2 million votes and more than 1.5 percentage points deserves the presidency. And it explains how that might be possible, albeit a long shot.

Though electors (who are typically regular people) rarely differ from their state's voting, there is no federal law that requires them to do so.

If you feel scared about the current state of American politics and Whitehouse sign this petition: https://t.co/2K88hLD8hn — #CountryOfKindness (@ladygaga) November 10, 2016

Electoral College Electors: Electoral College Make Hillary Clinton President on December 19 - Sign th... https://t.co/aCSR4Rovgp via @Change — P!nk (@Pink) November 11, 2016

Electoral College: Make Hillary Clinton President on 12/19. Sign HERE: https://t.co/oPjJWDqBOF - Team Sia — sia (@Sia) November 11, 2016

Petition asking Electoral College to vote HRC 12/19 https://t.co/kcev3DvIyS — KOOL A.D. (@veeveeveeveevee) November 10, 2016