Presidential hopeful Sen. Elizabeth Warren rolled out a new proposal Friday morning that calls on Congress to codify federal protections for abortion rights as she warned Republican efforts to undo Roe v. Wade “just might work.”

The Massachusetts Democrat sounded the alarm while pointing to recent legislation in a slew of states, including Alabama and Georgia, that would effectively block or severely restrict women from accessing abortion services. The bills clash explicitly with the Supreme Court’s landmark ruling establishing federal guarantees to abortion rights and could pave the way for a new high court challenge.

“These extremist Republican lawmakers know what the law is — but they don’t care,” Warren wrote. “They want to turn back the clock, outlaw abortion and deny women access to reproductive health care. And they are hoping the Supreme Court will back their radical play. I’ll be blunt: It just might work.”