Texas legislators have begun debating a controversial abortion bill.

The bill requires women to view an ultrasound, hear the fetus' heartbeat, and then wait 24 hours before undergoing an abortion.

A version passed by the state Senate allows women to opt out of the ultrasound requirement by signing a waiver.

Critics say the measure is an attempt to guilt women out of having an abortion.

Advocates respond that they're trying to give women the most complete information about their decision.

The bill was put on the fast track by Gov. Rick Perry.