“Sometimes you just have to give up,” Reid said in an interview with The Associated Press.
While Sanders has said he will take his campaign to the party’s nominating convention in July, Reid said he should “face reality” after next week’s primaries in California and New Jersey.
“I’ve never been to good at math, but I can figure that one out. I think he better do a little mathing,” Reid said.
Clinton currently has 1,769 pledged delegates, with Sanders at 1,501, according to The Associated Press.
In addition, the former first lady has the support of 543 superdelegates; Sanders currently has 44.
In total, Clinton is about 70 delegates away from surpassing the 2,383 total needed to clinch the nomination.