Twitter

Cybersecurity experts agree that if President Trump is using his old Android smartphone, it poses a big risk. The same experts say there are ways for Trump to tweet securely.

In a tweet, President Trump called for a major investigation into voter fraud. But some election experts say there's no evidence to back his claim.

Cybersecurity requirements for presidential smartphones could limit Trump's use of an app like Twitter, but President Trump also could ignore any recommendations that inhibit his use of social media.