President TrumpDonald John TrumpTeachers union launches 0K ad buy calling for education funding in relief bill FDA head pledges 'we will not cut corners' on coronavirus vaccine Let our values drive COVID-19 liability protection 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) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout 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."