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.