A veteran State Department negotiator predicted that as the Trump administration struggles to find an off-ramp out of the Iran war, a ground invasion seems more likely."The administration is frustrated," David Miller told CNN on Saturday, saying that Trump will likely try "to go back to Project Freedom with some variation," referring to the short-lived effort to escort ships through the Strait of Hormuz, where Iran has a blockade.The difference with a new attempt at Project Freedom would be "the deployment of ground troops on one of those key islands" that are part of Iran, like Larak Island, Miller said. Such an invasion "would surprise me," he added."They're looking for a way to break out of this," Miller said. "But right now, I suspect the situation is going to get worse before it gets worse."Miller made the comment as Secretary of State Marco Rubio and Special Envoy Steve Witkoff met with a Qatari mediator in Miami on Saturday to negotiate with Iran."It wouldn't surprise me if Iranians came back with a response that the administration doesn't like, or if they delay further," Miller said. "What's the alternative? Economic blockade and military strikes on both sides have created a situation where neither side is getting what they want."