In recent days, as many as two dozen Republicans had raised concerns with the “Pain Capable Unborn Child Protection Act” that would ban abortions after the 20th week of a pregnancy. Sponsors said that exceptions would be allowed for a woman who is raped, but she could only get the abortion after reporting the rape to law enforcement.

A vote had been scheduled for Thursday to coincide with the annual March for Life, a gathering that brings hundreds of thousands of anti-abortion activists to Washington to mark the anniversary of the Supreme Court’s 1973 Roe v. Wade decision that legalized abortion.

But Republican leaders dropped those plans after failing to win over a bloc of lawmakers, led by Reps. Rene Ellmers (R-N.C.) and Jackie Walorski (R-Ind.), who had raised concerns.