In an interview with The Associated Press, the Senate minority leader said on Wednesday that the Vermont senator should not prolong his presidential bid through the Democratic National Convention in Philadelphia in July, given his opponent Hillary Clinton’s nearly insurmountable lead in the delegate count.

“I’ve never been too good at math, but I can figure that one out. I think he better do a little mathing,” Reid said.

The Senate minority leader previously endorsed Clinton in February after she won the primary in Nevada, his home state.