A federal appeals court has overturned President Obama’s controversial recess appointments from last year, arguing he abused his powers and acted when the Senate was not actually in a recess. The three-judge panel’s ruling is a major blow to Mr. Obama. The judges ruled that the appointments Mr. Obama made to the National Labor Relations Board are illegal, and the board no longer has a quorum to operate. But the ruling has even broader constitutional significance, with the judges arguing that the president’s recess appointment powers don’t apply to “intrasession” appointments — those made when Congress has left town for...