Trump Full Thank You Speech Starts at: 7:31 Donald Trump returned to his campaign roots Thursday in his first major public appearance since Election Day, resembling the pugnacious, brawling campaigner more than the traditional president-to-be as he held court in front of thousands of adoring fans — and even announced a Cabinet pick from the stage. Trump's first stop on this "Thank you" tour to salute his supporters was in Ohio and, ever the showman, he made the surprise announcement that he will be offering the post of Defense Secretary to retired Marine Corps Gen. James Mattis. Trump said he was supposed to unveil that Monday, so he jokingly warned the Cincinnati crowd to "not tell anyone." SUBSCRIBE to ABC NEWS: www.youtube.com/ABCNews/ Watch More on abcnews.go.com/ LIKE ABC News on FACEBOOK www.facebook.com/abcnews FOLLOW ABC News on TWITTER: twitter.com/abc GOOD MORNING AMERICA'S HOMEPAGE: gma.yahoo.com/