WASHINGTON — Senate Republicans on Wednesday blocked a Democratic effort to increase spending on election security measures, saying they wanted to see what states do with grants they have already been provided.

The amendment, which would have appropriated $250 million for grants to states through the federal Election Assistance Commission, garnered 50 in favor to 47 opposed, largely on party lines and shy of the 60 needed to pass. Tennessee Sen. Bob Corker was the only Republican to vote in support of the amendment.