(CNN) Michael Pratt, Massachusetts Democratic Sen. Elizabeth Warren's finance director, is in the process of leaving Warren's presidential campaign as a result of the senator's recent decision to swear off soliciting money from wealthy donors during the primaries, according to a Warren campaign aide.

The aide told CNN Sunday morning that Pratt was "still a consultant but winding things down and transitioning out since we made the decision not to have (Warren) do high dollar events."

News of the departure came at the close of the first quarter fundraising deadline. In the coming days, a more complete picture of the Warren campaign's fundraising efforts is expected to come into focus. Her team has so far not released any early fundraising numbers, raising speculation that she is lagging behind her competitors.

The New York Times reported Sunday that Pratt resigned after a Valentine's Day meeting in Washington that eventually "grew heated," in which Pratt "noted that campaigns often collapse when they run out of money and pleaded with her not to cut off a significant cash stream."

"He pointed out that winning over wealthy fund-raisers across the country helped build networks that could translate into political support, not just checks," the Times said. "But Mr. Pratt lost the argument to two of Ms. Warren's closest advisers, Dan Geldon and Joe Rospars, who made the case about standing apart from the field and freeing up her schedule."

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