Attorney General Eric Holder is resigning after heading the Justice Department for six years. A White House official says President Barack Obama will announce Holder's departure later Thursday. Holder, a former judge and prosecutor, is the first black attorney general, and his tenure is the fourth longest on the job. He is among only a handful of cabinet officials who have retained their posts since the beginning of Obama's presidency. He has previously spoken about his resignation, indicating he was planning to leave office sometime this year. He plans to remain at the Justice Department until his successor is in place.