Attorney General Eric Holder praised left-wing activist Rev. Al Sharpton at the opening of the National Action Network (NAN) convention on Wednesday, and also stressed that the Justice Department is conducting a thorough investigation of the fatal Trayvon Martin shooting that “will examine the facts and the law.”

Sharpton, president of NAN and host of MSNBC’s Politics Nation, has led several rallies demanding the arrest of George Zimmerman, who reportedly shot Martin on Feb. 26. On Mar. 30 in Sanford, Fla., where the shooting occurred, Sharpton pledged that his group would “move to the next level if Zimmerman isn’t arrested.