"You've had three weeks to consult with lawyers," the fed-up senator said while lashing out at Trump's nominee after he refused to answer questions.

The exchange between U.S. Sen. Elizabeth Warren and former U.S. Rep. Billy Long came in the context of the Trump White House's ongoing duel with Harvard University.

A former congressman who sponsored legislation to abolish the IRS and is now the nominee to lead that agency faced pointed questions from senators Tuesday about his past promotion of questionable tax credits,