The aide told CNN Sunday morning that Pratt was "still a consultant but winding things down and transitioning since we made the decision not to have (Warren) into high dollar events."
News of the departure came at close of the first quarter fundraising deadline. In the coming days, a more complete picture of Warren campaign's fundraising efforts is expected to come to focus. Her team has so far not released any early fundraising numbers, raising speculation that she is lagging behind her competitors.
"He pointed out that winning 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 Mrs. Warren's closest advisers, Dan Geldon and Joe Rospars, who made the case about standing outside the field and freeing her schedule."
The Warren aide would not comment on Valentine's Day details to CNN. Geldon, Warren campaign chief of staff, and Rospars, and Warren strategist, both did not respond to requests for comment. Pratt also did not respond to requests for comment.
fundraising numbers will lie behind those of its competitors, one senior Warren aide insisted CNN on Sunday that the decision to skip high-dollar fundraisers and outreach was made with full recognition of the trade-offs
The aide pointed to the unusually expansive territory Warren has been able to cover so far beyond a handful of early states – including a Southern campaign swing to Mississippi, Alabama and Tennessee earlier this month, and a rally in Long Island City, New York – as well as her robust policy rollouts .
The aide said they saw Warren as among the most active candidates in the field, and they see this as a direct result of the senator not spending any time courting high-dollar donors.
But there is no question that a weak first quarter fundraising number would be a setback for Warren. Her seeming failure to shore up the enthusiasm in the early stage of the race would raise questions about her electability, and it would be particularly noteworthy given the early massive fundraising hauls of Sen. Bernie Sanders and Former Rep. Beto O'Rourke.
CNN's Jeff Zeleny and Eli Watkins have contributed to this report