The GOP frontrunner and the Massachusetts Senator are at it again.

In a war of words on Twitter, Republican soon-to-be nominee Donald Trump and outspoken Massachusetts Senator Elizabeth Warren spent the week trading barbs over social media, a fight that came to a head on Friday.

The dispute started Tuesday following Trump’s primary win in Indiana, which caused fellow GOP contenders Ted Cruz and John Kasich to drop out of the race, leaving Trump as the lone Republican candidate.

Warren expressed her thoughts on the matter in a series of tweets blasting Trump’s rhetoric.

On Friday, Trump responded to Warren’s attacks by bringing up Warren’s heritage. (In her Senate election in 2012, Warren was questioned after listing her heritage as Native American.) 

Warren fired back almost immediately on Friday.

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