aboard air force one president barack obama remain confident fbi director jam comey ability lead agency aftermath probe democrat hillary clinton use private email server white house say monday president view director comey man integrity man principle white house spokesman josh earnest tell reporters brief president view change ... continue confidence ability run fbi comey face intense criticism decision inform congress days tuesday presidential election newly discover email might pertain investigation clinton use private server secretary state roil race sunday tell lawmakers investigators complete review additional email change federal bureau investigation july find criminal wrongdoing clinton use server white house attempt remain neutral comey handle probe say monday give advance notice announcement sunday president entirely confident director comey use authority advantage particular political candidate particular party earnest say obama continue back fbi director comey white house