Washington (CNN)Donald Trump's assertion that the United States has "no choice" but to send 20,000 to 30,000 combat troops to fight ISIS in the Middle East raises a slew of complicated questions, military analysts said Friday.
It also represents an about-face.
In October, Trump spoke of potential perils.
"Everybody that's touched the Middle East, they've gotten bogged down," Trump said on NBC's "Meet the Press." "I don't want to see the United States get bogged down. We've spent now $2 trillion in Iraq, probably a trillion in Afghanistan. We're destroying our country."
At the CNN-hosted debate Thursday night, the Republican presidential front-runner sounded a different note.
"We really have no choice. We have to knock out ISIS," he said. "I would listen to the generals, but I'm hearing numbers of 20,000 to 30,000."
Ohio Gov. John Kasich took the same position on the fight against ISIS, saying, "You have to be on the ground."
And Texas Sen. Ted Cruz urged that "we need to put whatever ground power is needed."
But military analysts say sending U.S. troops to fight ISIS raises complex issues, some of them strategic, many political and others simply logistical.