After Donald Trump's GOP outreach in Washington this week, CBS' "Face the Nation" brings you the latest on the 2016 campaign trail, with RNC chair Reince Priebus, former Defense Sec. Bob Gates, Congressional Republicans, and others. Rep. Chris Collins, R-New York, Rep. Marsha Blackburn, R-Tennessee, and Rep. Peter King, R-New York, discuss the reasons they support Donald Trump The dynamic between businessman Donald Trump and House Speaker Paul Ryan (R-Wis.) is explored; an interview with former Secretary of Defense Robert Gates; a political debate featuring Jamelle Bouie, Michael Gerson, Julie Pace and Susan Page