Bernie Sanders just fired some shots at Hillary Clinton and said that the former first lady and secretary of the state is basically a fair-weathered liberal, who is progressive only on "some days."

During a town hall meeting in New Hampshire, Clinton defended herself from Sanders' allegations and said that the Vermont senator's comments are a "low blow" and then proceeded to enumerate a list of "liberal" accomplishments that proved she is a progressive from the start.

Clinton said, "We've been fighting the progressive fight and getting results for people for years," she further added that, "I hope we keep it on the issues. Because if it's about our records, hey, I'm going to win by a landslide."

Sanders' comments came when he was asked by reporters if he thinks Clinton was a progressive, in which he answered that "some days, yes." He expounded on his answer and said that the reason he thinks Clinton is only a progressive every now and then is because, often than not, she proudly declares that she is a "proud moderate," which Sanders interpreted as not being a progressive.

Sanders comments came when he was asked by reporters if he thinks Clinton was a progressive, in which he answered that "some days, yes." He expounded on his answer and said that the reason he thinks Clinton is only a progressive every now and then is because, often than not, she proudly declares that she is a "proud moderate," which Sanders interpreted as not being a progressive.

The senator said that he thinks that Clinton would have a hard time fighting the establishment, as her campaign have become very dependent on super PACs and Wall Street money, according to Business Insider.

Sanders then went to Twitter and escalated his accusation and said, "You can be a moderate. You can be a progressive. But you cannot be a moderate and a progressive."

And although he did not name names, Sanders went to Twitter and posted a series of tweets that is a clear jab at the Clinton campaign, TIME noted.

Sanders said that the "progressives" that he knows did not receive million dollars from Wall Street, while also giving light to the issue of the controversial Keystone XL pipeline.

This new word war between Sanders and Clinton served as a preview of their upcoming debate, which Sanders has recently agreed to after some consideration.

The New York Times confirmed that Sanders would attend the debate and said that unlike Clinton who's hesitant before to participate, he said that he have always wanted more debates.

Sanders also accused Clinton of avoiding debates and said that the only reason she wants to participate in one now is because of the narrow win she got during the Iowa caucuses.

The Clinton-Sanders one-on-one debate will happen at the University of New Hampshire, with Chuck Todd and Rachel Maddow of NBC serving as moderators.