Trump's 'I don't know' presidency

When Donald Trump first got into politics, he prided himself as the world's highest authority on everything from construction to the wind. But, now that his poll numbers are cratering, Trump has a new catchphrase: "I don't know." MSNBC's Ayman Mohyeldin, Catherine Rampell and Antonia Hylton spoke with The Bulwark's Tim Miller and MSNBC Political Analyst Rick Stengel on Trump's efforts to pivot blame to anybody but himself.