Fiery Sirius XM radio host Chris "Mad Dog" Russo barked Monday at U.S. Olympic soccer goalie Hope Solo, saying on Twitter she should "shut up" as the Americans faced Canada at the 2012 London Games.

Solo's series of tweets at NBC Olympic soccer analyst Brandi Chastain, which were spurred by Chastain's criticism of the U.S. women's lax effort in a 3-0 victory against Colombia, so incensed Russo that the former "Mike and the Mad Dog" host said he could not root for Team USA as they squared off against Canada Monday.

"Call me UnAmerican, but Go Canada," Russo tweeted Monday afternoon. "I can't root for this women's soccer team. And that's for Hope Solo... shut up."

Russo gloated as Canada took a 2-1 lead against the Americans.

"2-1 Canada, Hope Solo missed another save. The Canadians strike again!" he tweeted, adding that "Hope Solo comes up small again" when Canada went ahead 3-2. 

But the usually loud "Mad Dog" went quiet as the U.S. scored an equalizer and Alex Morgan scored the winning goal in the last seconds of extra time, propelling the U.S. to victory. 

Russo returned to Twitter minutes after the win and said his criticism was backed up, noting Solo allowed three goals.

"I'll give US credit, great win, Hope Solo did nothing," he tweeted

The outspoken Russo sided with Chastain in her feud with Solo when the squabble first surfaced July 28.

"How about Hope Solo shuts up for 10 minutes and makes a save? She choked in the World Cup, pipe down," Russo tweeted July 31, referring to the U.S. women's loss in the 2011 World Cup to Japan, where Solo allowed two goals in regulation and three scores in the penalty shootout. "Chastain said nothing wrong."

But in Solo's eyes, the NBC commentator was out of line.

The U.S. goalkeeper told Chastain to "lay off commentating about defending and gking (goalkeeping) until you get more educated ... the game has changed from a decade ago.

"It's important 2 our fans 2 enjoy the spirit of the Olympics," Solo continued. "Its not possible when sum1 on air is saying that a player is the worst defender!"

Solo didn't back down from the critical tweets when she addressed the media July 31.

"I have my beliefs that the best commentators and the best analysts should be analyzing come Olympics, come World Cups, and it's only my opinion," she said, according to "You can take it or leave it, to be honest, so it's my opinion, and I think analysts and commentators should bring energy and excitement and passion for the game, and a lot of knowledge, and I think it's important to help build the game, and I don't think Brandi has that."