Republicans and Democrats on Monday started their first day back from the long Thanksgiving break in open warfare over President Trump’s decision to make Mick Mulvaney the acting director of the Consumer Financial Protection Bureau, which will likely make it even harder for Congress to complete the long list of partisan issues it has to deal with this month, such as tax reform and funding the government.

“The man they want running the agency called it a sick, sad joke,” an angry Sen. Sherrod Brown, D-Ohio, the ranking member on the Senate Banking Committee, said Monday, referring to Mulvaney’s longtime opposition to the CFPB.