WASHINGTON — George W. Bush is backing presumptive Republican White House nominee Mitt Romney.
The former president offered a four-word endorsement of Romney as the doors of his elevator were closing after a speech Tuesday in Washington.
Bush said: "I'm for Mitt Romney."
ABC News caught Bush after the speech, prompting his unscripted — but not surprising — endorsement.
Bush's parents, former President George H.W. Bush and Barbara Bush, endorsed Romney in March during an appearance in Texas. Former Florida Gov. Jeb Bush also publicly backed Romney.
Romney's campaign issued a brief statement welcoming the support.
Since leaving office in January 2009, George W. Bush has tried to avoid politics.