During the campaign and the early months of his presidency, the concern over Trump’s Twitter use was political. Now the worry is increasingly legal.

There was a time in the not-too-distant past when President Donald Trump refrained from flamethrowing messages on Twitter. That time is over. Never mind that his aides have asked him to stop. Never mind that now the lawyers have told him to stop. Even though his White House has been warned that tweets could be used as evidence against him, President Trump has made clear in the days after returning from a largely Twitter-free overseas trip that he fully intends to stick to his favorite means of communication. Throughout 2016’s campaign and into the early months of his presidency, the concern among Trump’s advisers was mainly political. Every time the president let loose with one of his 140-character blasts, it distracted from his agenda and touched off a media frenzy that could last for days. But now the worry has turned increasingly legal. With multiple investigations looking at whether the president’s associates collaborated with Russia to influence the election, any random, unfiltered tweet could become part of a legal case.