title: Republican Senator John McCain leaves Washington before expected tax vote
text: WASHINGTON (Reuters) - Republican U.S. Senator John McCain is expected to miss an upcoming vote on a tax code overhaul, after his office said he had returned to his home in Arizona following medical treatment. The Senate is expected to vote as early as Tuesday on tax legislation. But McCain, undergoing treatment for brain cancer, will be out of Washington until January, his office said on Sunday. Top U.S. Republicans said on Sunday they expected Congress to pass the tax bill. 