The IRS was given seven days to produce the documents, with the deadline falling on 10 April.
After the deadline was missed, US treasury secretary Steven Mnuchin released a statement in which he said that the request raised “serious issues concerning the constitutional scope of Congressional investigative authority, the legitimacy of the asserted legislative purpose, and the constitutional rights of American citizens.”
He added that he is talking to the justice department about the matter and will review the committee’s request “carefully”.
The issue of Trump publishing his tax returns has rumbled on since he announced his candidacy in 2015. He has previously claimed he would be willing to make them public but is now refusing.
Earlier this month, a separate congressional committee requested that accountancy firm Mazars USA turn over the president’s 2011/2013 financial records. Mazars told the committee that it wanted a “friendly subpoena” to do so.
The request to Mazars came after Michael Cohen, Trump’s former lawyer, testified in front of Congress that Trump had at different stages both inflated his worth to mislead lenders, and deflated it to reduce real-estate taxes.