Senate Minority Leader Harry Reid accused Sen. Chuck Grassley Tuesday of using his control over the Senate Judiciary Committee to block President Obama’s Supreme Court nominee, in order to let Donald Trump make a new pick if he wins the White House.

Reid, D-Nev., said on the Senate floor that Trump’s recent remarks about a U.S. judge not being able to rule fairly in a case about Trump University because his parents are from Mexico were “racist and un-American.” But he said Grassley hasn’t condemned Trump.