The US Supreme Court on Friday temporarily prevented a Louisiana law imposing strict regulations on abortion clinics from taking effect in a case that presents a key test on the contentious issue following last year's retirement of Justice Anthony Kennedy, a key supporter of abortion rights. A one-page order issued by Justice Samuel Alito said that 'the justices need time to review' the various court filings before making a decision on the emergency application filed by Shreveport-based abortion provider Hope Medical Group for Women to block the law. The restrictions were due to go into effect on Monday.