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Posted: 6:08 PM May 15, 2012 Reporter: Associated Press
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 up with Bush after the speech, prompting his unscripted - but not surprising - endorsement.
Bush's parents, former President George H.W. Bush and mother Barbara Bush, endorsed Romney in March during a joint appearance in Texas. Former Florida Governor Jeb Bush also has publically backed Romney.
Since leaving office in January 2009, Bush has tried to avoid politics and had yet to endorse Romney. Bush left the White House deeply unpopular with voters who blamed him for the economic crisis that began during his administration.