Donald Trump and Hillary Clinton slammed each other over the Iraq War and the fight against ISIS at a national security forum Wednesday, with the Republican nominee also appearing willing to allow undocumented immigrants wishing to serve in the military to remain in the U.S.

Though Trump and Clinton did not appear onstage together at the USS Intrepid museum in New York, the NBC News forum was a debate in all but name and came fewer than three weeks before the candidates’ first debate.

Trump’s response to a question about whether illegal immigrants who plan to serve in the military can stay in America marked another apparent shift for the Republican nominee, who caused outrage during the GOP primary with his call to deport all illegal immigrants.

“I think that when you serve in the armed forces, that’s a very special situation, and I could see myself working that out,” Trump said. “We need to be careful and vet carefully, but it would be a special circumstance, yes.”

Trump levied unusual criticism against America’s military leaders, saying the generals have been “reduced to rubble” during President Barack Obama’s administration. He also suggested he would shake up the military’s top ranks if he wins in November, saying there would probably be “different generals.”

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