President Donald Trump Jabin Botsford | The Washington Post | Getty Images

President Donald Trump and his business filed suit against Democratic House Oversight Committee Chairman Elijah Cummings on Monday to block a subpoena sent last week seeking information about the president's finances. In the complaint filed in Washington, D.C., federal court Monday morning, Trump's lawyers said that Democrats have "declared all-out political war" against him. "Subpoenas are their weapon of choice," the filing states.

Last week, the House Oversight and Government Reform Committee subpoenaed Mazars, an accounting firm that Trump had used to prepare several years of financial statements, according to the lawmakers' document. The subpoena requested a slew of financial documents and related materials from Trump, his trust, the Trump Organization, the Trump Corporation, Trump's holdings company, the Trump Foundation and the Trump International Hotel in Washington. Mazars told the committee that it would not be able to comply with demands for those documents without a subpoena, according to Cummings. In a statement, Cummings said that Trump has a "long history of trying to use baseless lawsuits to attack his adversaries, but there is simply no valid legal basis to interfere with this duly authorized subpoena from Congress." Cummings added: "This complaint reads more like political talking points than a reasoned legal brief, and it contains a litany of inaccurate information. The White House is engaged in unprecedented stonewalling on all fronts, and they have refused to produce a single document or witness to the Oversight Committee during this entire year." Mazars and Peter Kenny, the Oversight Committee's chief investigative counsel, are also listed as defendants in the lawsuit. Trump's lawyer in the lawsuit, William Consovoy, said in a statement that the attempt by Cummings' committee to "obtain years' worth of confidential information from their accountants lacks any legitimate legislative purpose, is an abuse of power, and is just another example of overreach by the president's political opponents." The president's counsel, Jay Sekulow, told NBC News: "We will not allow Congressional Presidential harassment to go unanswered."

U.S. Rep. Elijah E. Cummings (D-Md.) during a news conference to introduce H.R.1, the 'For the People Act,' on the U.S. Capitol on Friday, January 4, 2019, in Washington, D.C. Salwan Georges | The Washington Post | Getty Images

The White House did not immediately provide a statement to CNBC regarding the lawsuit. Trump's lawyers argue that Cummings' subpoena lacks a "legitimate legislative purpose," and is therefore an invalid action for a congressional committee to take. "With this subpoena, the Oversight Committee is instead assuming the powers of the Department of Justice," the complaint says. "Its goal is to expose plaintiffs' private financial information for the sake of exposure, with the hope that it will turn up something that Democrats can use as a political tool against the president now and in the 2020 election." The filing goes on to attack the credibility of the subpoena by connecting it to testimony given in February by Trump's former longtime personal attorney, Michael Cohen. Cohen's damning testimony before the House Oversight Committee on Feb. 27 — in which Trump's former fixer called his ex-boss a "racist," a "cheat" and a "con man" — offered "one of the worst examples of the House Democrats' zeal to attack President Trump under the guise of investigations," Trump's lawyers said.