The former federal prosecutor, who Trump reported hired a mere three weeks ago, said he was leaving Greenberg Traurig permanently after recognizing that he could not work for the firm and represent Trump in Special Counsel Robert Mueller's investigation of Russian meddling in the 2016 election.
"This way, my sole concentration can be on this critically important matter for our country", he said in a statement provided to Bloomberg Law by the firm.
In a brief interview Thursday, Giuliani said there was no acrimony inside the firm regarding his work for Trump, saying that "half the firm is for him, maybe half against - fifty-fifty".
In a statement, Richard Rosenbaum, executive chairman of Greenberg Traurig, said that Giuliani originally meant to "play a limited role, for a short period of time" representing Trump.
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In interviews, Giuliani suggested that such payments were not uncommon at his law firm to calm accusations confronting wealthy and well-known people. The payment was made less than two weeks before the 2016 election and has been criticized as a possible campaign contribution meant to protect Trump and help his pursuit of the White House.
In a series of television and print interviews last week, Giuliani made waves when he revealed that the president repaid his personal lawyer, Michael Cohen, for a $130,000 payment made to porn star Stormy Daniels as part of a nondisclosure deal barring her from discussing an alleged affair with Trump.
Giuliani joined the team almost one month after the resignation of John Dowd, a former personal attorney to Trump.
Trump had previously denied knowledge of the payment.
Though the reimbursement was made only a month before Trump's 2016 election, Giuliani has said it "was not campaign money", and therefore it was not a campaign finance violation.