Here’s a thought exercise: Imagine a Trump presidency without him tweeting. He wouldn’t have publicly accused Barack Obama of wiretapping him; he wouldn’t have threatened former FBI Director James Comey of possibly having “tapes” of their conversations; he recently wouldn’t have undermined the legal defense of his travel ban; and he wouldn’t have attacked London’s mayor after the terrorist attack on that city. Now he might have actually SAID these things in interviews or public comments (though when was the last time he held a news conference?). But we know about these controversial statements because he tweeted about them, and that’s been a significant problem for the White House.