Trump had brief encounter with Giuliani on Saturday

President TrumpDonald John TrumpSchiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again.' Poll: Sanders leads 2020 Democratic field with 28 percent, followed by Warren and Biden More than 6 in 10 expect Trump to be reelected: poll MORE briefly met with his attorney Rudy GiulianiRudy GiulianiBill Barr is trying his best to be Trump's Roy Cohn Former US ambassador Yovanovitch lands a book deal: report Kerry responds to Trump accusation he violated Logan Act: 'Another presidential lie' MORE on Saturday as Giuliani faces a federal investigation over possible campaign finance violations, Bloomberg News reported.

The two men met Saturday night at Trump's Mar-a-Lago resort in West Palm Beach, Fla., where Trump spent the weekend ahead of this week's Christmas holiday. It was unclear what the two men discussed, according to Bloomberg. The White House did not immediately return a request for comment from The Hill.

A communications aide to Giuliani, Christianné Allen, tweeted a picture of herself next to a smiling Trump on Sunday morning, hours after the meeting occurred.

Giuliani also remains under investigation for possibly failing to register as a foreign agent, the same charge that ensnared other members of Trump's inner circle, including Paul ManafortPaul John ManafortFree Roger Stone Trump tweets test Attorney General Barr Maxine Waters blasts Trump as 'mafia boss' over Stone case MORE, his former campaign chairman.

The former New York City mayor has been at the center of the House's impeachment inquiry into Trump due to his efforts in Ukraine to uncover possibly damaging information on former Vice President Joe BidenJoe BidenButtigieg campaign claims 'irregularities' in Nevada caucuses Poll: Sanders leads 2020 Democratic field with 28 percent, followed by Warren and Biden More than 6 in 10 expect Trump to be reelected: poll MORE, a top contender for the Democratic Party's 2020 nomination.

Trump's and Giuliani's efforts to convince Ukrainian officials, including the country's new president, Volodymyr Zelensky, to open criminal investigations into Biden ahead of the 2020 election have been characterized by critics as an attempt to solicit foreign interference in a U.S. election.