The biggest roadblock for Trump's tax plan could be Trump himself

Chip Somodevilla/Getty Images Republicans are trying to finalize their tax proposal. Trump's tweets on 401(k) savingsand attackingGOP Sen. Bob Corker could be a signal of things to come. Adding a volatile presidential social media account to the already difficult process of rewriting the tax code could endanger the whole effort. Republicans attempting to come together on a massive overhaul of the federal tax code are facing a novel roadblock along the way: the president's Twitter account. Anothe...