President TrumpDonald John TrumpButtigieg surges ahead of Iowa caucuses Biden leads among Latino Democrats in Texas, California Kavanaugh hailed by conservative gathering in first public speech since confirmation 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.

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Giuliani joined Trump’s legal team last month, tasked with dealing with special counsel Robert MuellerRobert (Bob) Swan MuellerSpeier says impeachment inquiry shows 'very strong case of bribery' by Trump Gowdy: I '100 percent' still believe public congressional hearings are 'a circus' Comey: Mueller 'didn't succeed in his mission because there was inadequate transparency' 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."