Now, Romney said, the administration is just "whining." He said that "there should have been a negotiation before we just pull our troops out and then go in whining and talking about sanctions."
The Utah senator added sarcastically, "It's like, you've gotta be kidding. Of course this is what Turkey was going to do."
Mr. Romney told reporters. “It’s like the farmer who lost all his horses and goes to now shut the barn door.”
Mr. Trump got into an extended back and forth with Senator Lindsey Graham, Republican of South Carolina, normally among his closest allies but one of the sharpest opponents of his Syria decision.
“I hope President Trump is right in his belief that Turkey’s invasion of Syria is of no concern to us, abandoning the Kurds won’t come back to haunt us, ISIS won’t reemerge, and Iran will not fill the vacuum created by this decision,” Mr. Graham wrote on Twitter.