A federal US judge has overturned a controversial restriction imposed on abortion providers in Texas, deeming it an unconstitutional "undue burden" on women seeking to terminate pregnancies.
The restriction - which was set to go in effect on Tuesday - was among a host of new rules which critics say would have forced all but five of the sprawling state's 42 clinics to close.
Abortion is a key hot-button issue in US politics.
Opponents have in recent years imposed a host of restrictions aimed at deterring women from ending their pregnancies and making it harder for clinics to operate.
The Supreme Court has upheld its 1973 landmark Roe v Wade decision legalising abortion, but has approved of a number of restrictions such as waiting periods and a ban on late-term abortions.
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Texas state senator Wendy Davis won national attention with an 11-hour filibuster in June which briefly blocked the controversial bill before it was passed in a special session.
The bill bans all abortions after 20 weeks of pregnancy, limits the use of the abortion pill RU486, imposes expensive new building codes on clinics, and requires abortion providers to get admitting privileges at a nearby hospital.
Federal judge Lee Yeakel ruled that the admitting privilege requirement "does not bear a rational relationship to the legitimate right of the State in preserving and promoting foetal life or a woman's health and, in any event, places a substantial obstacle in the path of a woman seeking an abortion of a non-viable foetus and is thus an undue burden to her."
Similar restrictions imposed in Alabama, Mississippi and Wisconsin were also overturned by federal courts.
