Facing a former president federal charges is a big problem in itself, and it has never happened before in American history. Many of these charges fall under the anti-espionage law, which could lead to Trump being sentenced to many years in prison if convicted.
As bringing federal criminal charges against Trump or even convicting or imprisoning him does not affect his ability to run in the presidential election. Trump's first impeachment trial in campaign finance offenses, by paying $130,2024 to actress Stormy Daniel, will begin April.