From accidental leaks to unsecured networks, the encrypted messaging app has turned into a political landmine—exposing the vulnerabilities of America’s top officials. The first 100 days of Trump’s second presidential term have included a surprising player that doesn’t seem likely to go away anytime soon: Signal.

The first 100 days of Donald Trump’s second term have seen a president emboldened by his November victory move aggressively to enact his agenda and take aim at his perceived political enemies. Trump has transformed the use of executive authority,