U.S. President Donald Trump pauses while speaking to members of the media before boarding Marine One on the South Lawn of the White House in Washington, D.C., U.S., on Friday, April 26, 2019.

U.S. President Donald Trump, three of his children and the Trump Organization sued Deutsche Bank and Capital One, in a bid to block the two from responding to congressional subpoenas, according a Monday court filing.

The U.S. House issued a subpoena to Deutsche Bank earlier this month and the German lender had said in January that it had received inquiries from Democrat-controlled committees about its links to Trump. In the complaint filed on Monday, the president's team argued that his political opponents leading the House Intelligence and Financial Services Committees are on a fishing expedition.

"This case involves Congressional subpoenas that have no legitimate or lawful purpose. The subpoenas were issued to harass President Donald J. Trump, to rummage through every aspect of his personal finances, his businesses, and the private information of the President and his family, and to ferret about for any material that might be used to cause him political damage. No grounds exist to establish any purpose other than a political one," the complaint said.

The filing said the two banks have "long provided business and personal banking services" to the Trumps, and the subpoenas seeking a complete accounting of financial records are an instance of "remarkable overbreadth."