Democrats brought up the measure again to highlight Republican opposition to abortion rights and make the case to voters that the G.O.P. stance threatens access to reproductive health care.

Republicans have blocked for a second time this year legislation to establish a nationwide right to in vitro fertilization, arguing that the vote is an election-year stunt after Democrats forced a vote on the issue.

For the second time in three months, U.S. Senate Republicans have blocked a Democrat-led bill to federally-protect fertility treatments. Missouri U.S. Senators