The resistance movement against President Donald Trump has one of the country's premier historians onboard — and his reasons for opposing Trump are pretty terrifying. Leading historian at Yale, Timothy Snyder, warns that Trump could try overthrowing democracy during his presidency. In fact, he predicts it's "inevitable." Snyder has spent his career working on Modern Eastern Europe, and as such he has plenty of knowledge on authoritarian leaders. Using his research, he wrote a book to help get America through the Trump presidency and it's called On Tyranny: Twenty Lessons from the Twentieth Century. The book is more of a...