How divisions and narrow margins in Congress could present challenges for Trump

In a major victory for President-elect Trump, Republicans will now control both chambers of Congress after the House was called for the GOP this past week. But this trifecta doesn't guarantee smooth governing, as narrow margins could make passing major legislation difficult. Casey Burgat, legislative affairs program director at The George Washington University, joins William Brangham to discuss. PBS News is supported by - https://www.pbs.org/newshour/about/funders