The Manhattan District Attorney's case against former President Donald Trump must be strong to warrant an unprecedented arrest, according to Sen. Mark Kelly. The case, which is being led by Manhattan District Attorney Cyrus Vance Jr., is investigating Trump's business dealings and potential financial crimes. Vance's office has reportedly been investigating Trump's business practices for several years, and the case has gained renewed attention in recent months. In an interview with CNN, Kelly said that any arrest of a former president would be unprecedented and that the case against Trump would need to be strong to justify such a move. I think it's important that any case that's brought against a former president is strong, and that the evidence is there, Kelly said. And if it is, then I think it's appropriate for the legal system to take its course. Kelly's comments come as Vance's office has reportedly been ramping up its investigation into Trump's business practices. The investigation is said to be focused on whether Trump and his company, the Trump Organization, committed financial crimes, including tax fraud and insurance fraud. Trump has denied any wrongdoing and has called the investigation a witch hunt. He has also argued that the investigation is politically motivated, and has accused Vance of being a partisan hack. Despite Trump's claims, the investigation has continued to move forward. In recent months, Vance's office has reportedly been interviewing witnesses and issuing subpoenas for documents related to Trump's business dealings. If Vance's office does decide to bring charges against Trump, it would be a historic moment in American politics. No former president has ever been arrested or charged with a crime, and the prospect of such an event has raised questions about the limits of presidential power and the independence of the judiciary. For now, however, the investigation is ongoing, and it remains to be seen whether Vance's office will ultimately decide to bring charges against Trump. But as Kelly noted, any case against a former president would need to be strong to justify such a significant move.