President TrumpDonald John TrumpMnuchin knocks Greta Thunberg's activism: Study economics and then 'come back' to us The Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' What to watch for on Day 3 of Senate impeachment trial MORE’s lawyer and former New York City Mayor Rudy Giuliani was loudly booed at Yankee Stadium's Memorial Day game on Monday, his 74th birthday.

After the Yankees' PA announcer said the former GOP presidential candidate was in the stands and wished him a happy birthday, the crowd erupted into boos.

Members of the media quickly took to Twitter to point out the event.

ADVERTISEMENT

Giuliani joined Trump’s legal team last month, tasked with dealing with special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay MORE’s Russia investigation.

Since going to the White House, Giuliani has made a strong effort to discredit the Mueller probe, while still maintaining that Trump would welcome a sit-down interview with the special counsel.

On Sunday, Giuliani claimed the entire "basis" of the investigation into Russia's election meddling was "illegitimate."