President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's lawyers are preparing to do battle with Congress over a number of issues the new Democratic House majority is seeking to investigate.

The Washington Post reported Wednesday that the president's attorneys are preparing for legal battles over a number of issues for which Democrats are seeking documents, testimony or other evidence, including his tax returns and his involvement in the White House security clearance process.

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Rudy Giuliani, the president's attorney throughout the final weeks of the special counsel investigation into Russian election interference, told the Post that he had urged the president not to cooperate with any Democratic investigations, warning that the end result Democrats were hoping for was impeachment.

"I wouldn’t cooperate with any of them,” Giuliani said. “I’d fight it tooth and nail.”

Trump's personal business dealings before winning the 2016 election as well as his contacts with foreign leaders are just a couple of issues that the president and House Democrats have faced off on, and White House lawyers are prepared to argue that much of the information Democrats have requested falls under executive privilege, according to the Post.

His lawyers have reportedly urged some businesses, including an accounting firm that handles his finances, to not comply with congressional subpoenas, a move that has rankled some lawmakers.

One senior Democratic aide familiar with congressional efforts to obtain documents from Deutsche Bank, which did business with Trump while he was a private citizen, told the Post that it was unlikely that the bank and other firms would ignore a congressional subpoena.

“We don’t foresee any issue with them responding appropriately to our lawful and legitimate subpoena,” the aide told the Post. “I would be very surprised if any bank did not comply with a lawfully authorized subpoena from a congressional committee.”

Deutsche Bank told the Post in a statement that it was complying with all congressional investigations in which it was involved.

“We remain committed to providing appropriate information to all authorized investigations in a manner consistent with our legal obligations," the bank said.