PHOENIX - Arizona Attorney General Mark Brnovich announced Thursday he’s running for U.S. Senate, becoming the third major candidate seeking the Republican nomination to take on Democrat Mark Kelly. Brnovich, who is in his second term as the state’s lop law-enforcement officer, is the best-known GOP candidate and the only one with political experience. In a video announcement, Brnovich described himself as the son of immigrants who fled communism in Yugoslavia. He says he used his post as attorney general to take on "crony capitalists" and promote religious liberty, border security and election integrity.