Washington (CNN) Treasury Secretary Steven Mnuchin will again come face to face with California Rep. Maxine Waters, chair of the House Financial Services Committee, later this month as Democrats escalate their fight with the Trump administration over tax documents and other information.

Mnuchin's last appearance in April before the committee ended in a testy exchange with Waters in which he offered unprompted advice on how to conduct a meeting.

Waters announced Wednesday that he is now scheduled to continue his testimony before the committee on May 22.

The April showdown between Mnuchin and Waters came at the end of a day of back to back hearings for the secretary, who also appeared before the House Appropriations Committee, where he was grilled about responding to Democrats' request for President Donald Trump's tax returns.

Mnuchin this week denied a request from House Ways and Means Chairman Richard Neal for the tax returns. Neal has said he is consulting with House legal counsel on further steps.

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