WASHINGTON (Reuters) - A Republican-led committee in the U.S. House of Representatives approved a sweeping rewrite of U.S. tax law on Thursday, setting the stage for the House to vote on it, although momentum for overhauling the tax code was fast shifting to the Senate. The House Ways and Means Committee approved a bill, voting along party lines, that could go to the House floor as soon as next week. It would cut the U.S. corporate income tax rate to 20 percent from 35 percent and make other tax changes adding substantially to the federal deficit over the next decade.   