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Warren, who is closely aligned with progressive union groups, ripped Walker in a tweet Saturday for what some saw as a comparison between union members and the Islamic State of Iraq and Syria:

"If Scott Walker sees 100,000 teachers & firefighters as his enemies, maybe it's time we take a closer look at his friends.”

In a speech at the Conservative Political Action Conference on Thursday, Walker said , “If I can take on 100,000 protestors, I can do the same across the world.”

Walker, a possible 2016 presidential candidate for the GOP, tried to walk back his comments after his speech, which drew criticism from the left.