Before he began holding mass rallies, Twitter was Donald Trump's secret weapon for connecting with ordinary Americans in 140-character increments. He acquired millions of followers as a celebrity businessman and reality TV star before he was even active in politics.
Can Hillary Clinton turn that weapon against him? The Democratic front-runner is going to try. In what was billed as a major foreign policy address, Clinton lashed out at her Republican counterpart's social media habits, making them a key part of her critique of his temperament.
Does Trump have a Twitter problem? Like the rest of his riffing and risk-taking, his prolific use of social media websites to express unfiltered and occasionally ill-advised opinions worries Republicans who fear he will commit online blunders at the height of a campaign in which the GOP has little margin for error.
Clinton plans to use Trump's Twitter rants as Exhibit A in her case that he is too unhinged to be president of the United States. "She doesn't know what's going to work," Republican strategist Ford O'Connell told the Washington Examiner, so she is "throwing the kitchen sink" at Trump.
"Each new tweet is starting a new messaging avenue," O'Connell said. "It's ingenious, but it's not a science."