WASHINGTON — President Trump really doesn’t want House Democrats poking around in his finances. So on Monday morning, he slapped one of them with a lawsuit, demanding a judge make it stop.

Trump and a handful of his companies filed suit against Rep. Elijah Cummings of Maryland, Chairman of the House Oversight Committee, to block the committee’s subpoena of records from Trump’s longtime accounting firm, Mazars USA. The filing asks the judge to void the subpoena, arguing that the investigation into Trump’s finances is based on nothing more than partisan political harassment.

“The Democrat Party, with its newfound control of the U.S. House of Representatives, has declared all-out political war against President Donald J. Trump,” the document reads. “Subpoenas are their weapon of choice.“

Cummings’ committee subpoenaed Mazars last week for eight years’ worth of financial statements, communications and supporting documents regarding President Trump and his businesses. The move followed Congressional testimony from Michael Cohen, Trump’s longtime attorney and self-styled “fixer,” who claimed that Trump regularly misrepresented the size of his fortune in statements to banks and insurance companies. Cohen also handed over copies of those statements, which had been prepared by Mazars.

Trump’s lawsuit argues that Congressional investigations must be attached to some pending legislation — and that an inquiry focused solely on the question of whether the president may have engaged in criminal conduct should be ruled invalid, because it has no such basis.