JEFFERSON CITY — Shortly before 4 a.m. Thursday, the Missouri Senate pushed through a tough anti-abortion bill. Republicans declared victory for the unborn.

Several hours later, staff at the Planned Parenthood clinic in the Central West End — the only abortion clinic in Missouri — began getting calls. National media had begun to notice.

“I’ve been shuffling media around all morning,” said Jesse Lawder, spokesman for Planned Parenthood. “National, international, local — and they’re just showing up. Like I got a call from CBS Evening News this morning. They’re like, we’re at the airport.”

All eyes will be on the Missouri House Friday, where state representatives likely will approve the measure. They face a deadline of 6 p.m., when the legislative session ends.

The House passed a version of the bill earlier this year, but because the Senate made changes, the House needs to vote again before sending the measure to Gov. Mike Parson’s desk.

One of the most striking changes overnight was offered by Republicans. Under the House legislation, abortions would have been banned if a fetal heartbeat could be detected, which can occur as early as six weeks into a pregnancy.