President Trump warned the country’s top ranking military officials Tuesday that they could be headed to “war” with U.S. citizens, signaling a major escalation in the ongoing legal battle over his authority to deploy soldiers to police American streets. It’s a war from within.”Commanders should use American cities as “training grounds,” the president said. Oregon has already filed a legal challenge, and experts expressed concern that what the president described is against the law. “The threat has to be really serious, and I don’t think the Trump administration has made that case.”Others agreed. He railed against what he saw as the corrupted culture of the modern military — as well as its aesthetic shortcomings.