A federal judge is temporarily blocking a new Mississippi law that bans abortion after 15 weeks, the most restrictive abortion law in the United States.

U.S. District Judge Carlton Reeves on Tuesday granted a temporary restraining order requested by the state's only abortion clinic. Republican Gov. Phil Bryant signed House Bill 1510 on Monday, and it became law immediately.

Dr. Sacheen Carr-Ellis of the Jackson Women's Health Organization said in court papers filed Monday that a woman 15 weeks or more pregnant was scheduled for a Tuesday afternoon abortion.

The law and responding challenge set up a confrontation sought by abortion opponents, who are hoping federal courts will ultimately prohibit abortions before a fetus is viable. Current federal law does not.