Iowa legislators have approved a bill banning most abortions once a fetal heartbeat is detected, propelling the state overnight to the front of a push among conservative statehouses jockeying to enact the nation’s most restrictive abortion regulations. The bill now awaits the signature of anti-abortion GOP Gov. Kim Reynolds. Backers of the legislation hope an influx of conservative judicial appointments under President Donald Trump could put the question on track to challenge Roe vs. Wade.