WASHINGTON (Reuters) – Democratic U.S. Representative Cori Bush said on Tuesday the Justice Department is probing her campaign’s spending on security, adding that she is fully cooperating with the investigation. Bush, a member of the high-profile group of House progressives nicknamed “The Squad,” said in a statement that she had faced threats even before she was sworn into office in January 2021 and had used campaign funds for security. She denied wrongdoing. “As a rank-and-file member of Congress I am not entitled to personal protection by the House,” Bush said in a statement. “I have not use…