Democratic lawmaker serves notice to Mnuchin that she will be coming after him when he testifies on Tuesday

A California lawmaker,  already noted for her pointed and well-informed questioning of officials representing President Donald Trump's administration, said Treasury Secretary Steve Mnuchin can expect to answer for a lot when he appears efore a Democratic-controlled House committee on Tuesday.

Appearing on MSNBC with host Alex Witt, Rep. Katie Porter (D-CA) -- a Harvard and Yale-educated attorney who recently taught law at UC-Irvine -- said she will come prepared to put Mnuchin, who is refusing to turn over Trump's tax returns in defiance of the law, on the spot.

Referring to a previous contentious appearance by Mnuchin who complained that committee was wasting his time, the House Financial Services Committee member said she had no interest in bowing to his demands.

"I hope the tone will be different," Porter explained. "I think we need to try to calm things down and allow Congress to do its work and I hope Secretary Mnuchin arrives with that kind of attitude -- a real willingness to his job."

She then delivered a warning to the Trump appointee.

"It's not Congress's duty to kowtow to the president or his appointed secretary -- it's our job to conduct appropriate oversight," she asserted. "So I plan to try and be professional, but I am going to ask hard questions because that's my duty as a member of Congress."

She then took a pointed jab at Trump, stating, "It's a co-equal branch of government to the presidency, and I think this president is struggling with that concept."

You can watch below via MSNBC: