Nov 13 The U.S. Supreme Court on Friday agreedto hear a challenge by abortion providers to a Texas lawrequiring physicians performing the procedure to have admittingprivileges at local hospitals and clinics to meet certainhospital-grade standards.

Following is a timeline of that challenge.

July 2013 - The Republican-led Texas legislature passes andRepublican Governor Rick Perry signs the law known as H.B. 2,putting new requirements on abortion providers. State officialssay the law is intended to ensure the health and safety ofwomen.

September 2013 - Before the law is enforced, PlannedParenthood and other abortion providers challenge the measure,asserting that certain provisions, including the one related todoctors' admitting privileges, were aimed at decreasing theavailability of abortion in the state.

October 2013 - A U.S. district judge sides largely with thechallengers, blocking the admitting privileges provision.

March 2014 - The U.S. Court of Appeals for the 5th Circuitreverses the lower court and permits much of the law to takeeffect.

April 2014 - Whole Woman's Health and other abortionproviders bring a new complaint against Texas, citing the effectof the law's implementation and the number of clinics that haveclosed. The challengers focus on the admitting-privilegesrequirement and clinic standards.

August 2014 - A U.S. district court judge declares theadmitting privileges and clinic requirements an unconstitutionalburden on women's access to abortion.

October 2014 - The U.S. Court of Appeals for the 5th Circuitintervenes to allow implementation of both new regulations, butthe U.S. Supreme Court blocks part of the order so that themandate that clinics meet hospital-grade standards for surgeriesdoes not go into effect.

June 2015 - After considering the full merits of thechallenge, the U.S. Court of Appeals for the 5th Circuitreverses the district judge's decision, finding the judge shouldhave deferred to the legislature's stated health and safetygoals. The appeals court also says most of the lawsuit shouldhave been barred because the legal issues it raised already wereaddressed in the case filed by Planned Parenthood.

June 2015 - The U.S. Supreme Court by a 5-4 vote puts atemporary hold on the 5th Circuit's ruling while the justicesconsider whether to hear the challengers' appeal. That actionblocks the clinic regulation regarding hospital-grade standardsfrom taking effect.

September 2015 - The abortion providers challenging theTexas restrictions ask the U.S. Supreme Court to hear theirappeal of the 5th Circuit's ruling.

November 2015 - The U.S. Supreme Court agrees to hear thechallenge by abortion providers to the Texas restrictions. Thecourt was due to hear oral arguments early in 2016, with aruling due by the end of June.

(Compiled by Joan Biskupic in Washington; Editing by WillDunham)