US President Donald Trump and his business organizations filed a lawsuit Monday to block a congressional subpoena request issued by House Oversight Committee Chairman Elijah Cummings.

Representative Cummings issued a memo that prepared a subpoena for Mazars, USA, Trump’s accounting firm. After Michael Cohen’s testimony, the House Oversight Committee was interested in any potential alterations to Trump’s financial statements. However, the lawsuit filed in the DC District Court alleges that the subpoena was a Congressional overreach.

“Chairman Cummings has ignored constitutional limits on Congress’ power to investigate. Article I of the Constitution does not contain an ‘Investigations Clause’ or an ‘Oversight Clause.'” The complaint argues that the power to investigate is a function of the judicial branch or Department of Justice, not for a legislative body. President Trump believes the subpoena lacks any legislative purpose, and should be denied by the court.