JACKSON, Miss. — Mississippi’s only abortion clinic is expanding its challenge of a state law that bans abortion after 15 weeks.

The clinic, Jackson Women’s Health Organization, filed papers Monday asking a federal court to block state restrictions that have been the law for years, including a 24-hour waiting period that requires a woman to make two trips to the clinic — one for counseling and one to have the abortion.

The 15-week ban is the most restrictive abortion law in the United States, and the clinic sued the state hours ­after Republican Governor Phil Bryant signed it into law March 19.

A federal judge put it on hold the next day.

The clinic argues that Mississippi’s 15-week ban is unconstitutional because it prohibits abortion about eight weeks before a fetus would be able to survive outside the womb.

Nancy Northup is president and CEO of the New York-based Center for Reproductive Rights, which represents the clinic.

She said the Mississippi restrictions are about ‘‘shaming women’’ and reducing access to abortion.

‘‘As the restrictions pile up and women face higher and higher barriers to the care that they need, young people, women of color, those who live in rural areas and low-income populations suffer the greatest harm,’’ Northup said Monday in a conference call with reporters.

ASSOCIATED PRESS