SAN FRANCISCO — A federal appeals court refused Thursday to reinstate President Donald Trump's ban on travelers from seven predominantly Muslim nations, unanimously rejecting the administration's claim of presidential authority and questioning its motives. The panel of three judges from the San Francisco-based 9th U.S. Circuit Court of Appeals declined to block a lower-court ruling that suspended the ban and allowed previously barred travelers to enter the U.S. The court battle is far from over. The lower court still must debate the merits of the ban, and an appeal to the U.S. Supreme Court seems likely.