Sen. Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE (R-Iowa) suggested Saturday night that Republicans would lose their Senate majority if they don't pass their healthcare bill.

Grassley wrote on Twitter that Republicans should be "ashamed" that they haven't passed a healthcare plan yet to repeal and replace ObamaCare.

"WE WONT BE ASHAMED WE WILL GO FROM MAJORITY TO MINORITY," he added.

52 Republicazn senators shld be ashamed that we have not passed health reform by now WE WONT BE ASHAMED WE WILL GO FROM MAJORITY TO MINORITY — ChuckGrassley (@ChuckGrassley) July 9, 2017

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Grassley has been among a number of Republican senators sounding increasingly pessimistic about healthcare legislation efforts after Senate GOP leaders delayed a vote until after the July 4 recess.

“Compared to how optimistic I was the week before now ... I’m very pessimistic,” Grassley told constituents in Mount Pleasant, Iowa, on Thursday.