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Is President Trump's executive order temporarily barring entry into the U.S. from seven majority-Muslim countries within the bounds of presidential power? With Marc Fisher, Post senior editor and author of "Trump Revealed," we answer that and more.

We take a close look at Trump's tweets now that he's president. Can he make official policy statements on Twitter? And does that dictate government action? We explore the pros and cons when a president has a direct line to the people.