FILE PHOTO: U.S. President Donald Trump speaks to White House Chief of Staff John Kelly after an event with reporters in the Oval Office at the White House in Washington, U.S. REUTERS/Jonathan Ernst/File Photo WASHINGTON (Reuters) - White House Chief of Staff John Kelly will leave his job at the end of this year, U.S. “He’s a great guy,” Trump told reporters as he departed the White House for Philadelphia where he will attend the annual football game between the Army and Navy military academies.