WASHINGTON - After their humiliating loss on health care, Republicans in Congress could use a quick victory on a big issue. It won't be an overhaul of the tax code.

Tax reform could prove harder to accomplish than repealing and replacing Barack Obama's health law. Congressional Republicans are divided on significant issues, especially a new tax on imports embraced by House Speaker Paul Ryan. And the White House is sending contradicting signals on the new tax, adding to the uncertainty.

House Republicans also can't decide whether to move on from health care. Ryan canceled a scheduled vote on a House GOP plan after it became obvious that Republicans didn't have the votes.