Besides Cohen and Giuliani, Berman's office also subpoenaed Trump's inaugural committee over an investigation into potential illegal contributions from foreigners and charged former Congressman Chris Collins, a Trump ally, with insider trading.

Barr said Saturday that he was "surprised and quite disappointed" by Berman's statement and that he was "hoping for your cooperation to facilitate a smooth transition."

"Your statement also wrongly implies that your continued tenure in the office is necessary to ensure that cases now pending in the Southern District of New York are handled appropriately," the attorney general continued in the letter. "I fully expect that the office will continue to handle all cases in the normal course and pursuant to the Department's applicable standards, policies, and guidance."

U.S. Senate Minority Leader Chuck Schumer on Saturday called for Clayton to withdraw his name from consideration for the nomination to the position and for an investigation into the dismissal of Berman.

Clayton "can allow himself to be used in the brazen Trump-Barr scheme to interfere in investigations by the U.S. Attorney for the Southern District of New York, or he can stand up to this corruption, withdraw his name from consideration, and save his own reputation from overnight ruin," Schumer said in a statement.

U.S. Congressman Don Beyer, a Virginia Democrat, said that he thinks "Barr's letter provides no justification for Berman's removal."

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