House Ways and Means Committee Chairman Richard Neal has issued subpoenas for President Donald Trump’s tax returns, the committee told CNN, an escalation in the fight for the President’s personal financial records and the latest step this week in Democrats’ battle for information from the Trump administration.

Neal sent subpoenas to both IRS Commissioner Charles Rettig and Treasury Secretary Steve Mnuchin. A Treasury spokesman confirmed to CNN it has received Neal’s subpoena request. Neal, who has unilateral subpoena power, took the step days after the Treasury Department formally denied Neal’s request for six years of the President’s personal and business tax returns earlier this week.