(CNN) President Donald Trump's personal lawyers told the Supreme Court Monday that the House of Representatives and a Manhattan prosecutor should not be able to subpoena the President's longtime accounting firm and banks for his financial records, in a monumental dispute concerning separation of powers and claims of absolute immunity that will be heard by the justices later this term.

For years, the President has been battling a broad range of legal challenges attempting to force the release of his tax returns and other financial documents, and now the Supreme Court will hear arguments on the dispute sometime this spring and render an opinion by July -- just as the presidential election is gearing up.

"To call these subpoenas unprecedented would be an understatement," argued Jay Sekulow, one of the President's personal lawyers, in the opening briefs.

"Unleashing each and every House committee to torment the President with legislative subpoena after legislative subpoena is a recipe for constitutional crisis," Sekulow said.

The filings came as Chief Justice John Roberts is presiding over the Senate impeachment trial and Trump's legal team has spent hours on the Senate floor presenting the President's defense in the proceeding.

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