“When he makes statements like that, it just seems to me to be he’s going off on a tweet storm on his own, and it’s incredibly dangerous and irresponsible,” Biden told reporters, according to a video posted to Twitter by CBS News’s Bo Erickson.

“I have no idea whether he’s coordinated with any of our allies. I have no idea whether or not he has the support of his own generals,” the former vice president added. “This is a guy who seems to be unmoored.”