George Zimmerman, the former Floridian neighborhood watch volunteer who was acquitted of murder in the 2012 fatal shooting of unarmed black teenager Trayvon Martin, is suing Massachusetts Sen. Elizabeth Warren and former South Bend, Indiana, Mayor Pete Buttigieg for defamation.

The lawsuit focuses on tweets each of the presidential candidates sent on Feb. 5, the day Martin would have turned 25 years old. It was filed in Polk County, Florida, on Tuesday and claims Warren and Buttigieg tried using the killing “as a pretext to demagogue and falsely brand Zimmerman as a white supremacist and racist to their millions of Twitter followers,” according to Fox News.