Capitol Police on Tuesday morning arrested 13 protesters who were demonstrating against the Supreme Court's examination of restrictions to the abortion pill mifepristone.

       The Supreme Court justices on Tuesday are hearing arguments over whether the Food and Drug Administration lawfully relaxed restrictions to make it easier to access the drug to end a pregnancy. Mifepristone, the first pill taken in a two-drug regimen for a medication abortion, is the most common method of abortion in the country.

       Capitol Police said the 13 protesters were moving around the Capitol grounds and "illegally blocking roads and then a walkway."

       MORE: Supreme Court examines abortion pill restrictions in high-stakes challenge to FDA

       Abortion-rights activists are arrested by U.S. Capitol police as their protest outside of the Su...Show more ---Show more

       Jose Luis Magana/AP

       "Our officers warned the group to stop blocking the walkway or they would be arrested. They refused, so our officers arrested them,” a Captiol Police spokesperson said.

       Throughout the morning, there were large competing demonstrations outside the building. Small groups of pro-abortion rights demonstrators staged sit-ins on sidewalks and roadways.

       MORE: Abortion pill hearing live updates: Supreme Court considers challenge to popular medication

       It's not yet clear if the protesters were part of a specific group.