As special counsel Robert S. Mueller III continues to probe members of President Donald Trump’s 2016 campaign for possible collusion with Russia, some lawmakers have raised ethical concerns over the president’s alleged cover-up of an affair with porn actress Stormy Daniels.

Reps. Kathleen Rice of New York and Ted Lieu of California, both former prosecutors, have asked the FBI to investigate payments from Trump’s lawyer, Michael Cohen, to Daniels, who filed a lawsuit Tuesday against the president in Los Angeles Superior Court.

NBC News first reported the lawsuit.

Lieu and Rice believe the alleged “hush” agreement — which involved a $130,000 payment from Cohen to Daniels — violates federal election laws.

“[The] hush agreement & side letter attached to Stormy Daniels’ filing essentially shows coordination between @realDonaldTrump, Cohen & Daniels,” Lieu tweeted Tuesday night. “That means the $130k payment from Cohen to Daniels to silence her during the campaign violated federal election law.”