(CNN) - Mitt Romney and Rick Perry were bitter rivals last autumn and early winter, during the battle for the Republican presidential nomination, but that's apparently all ancient history.
Friday the Texas governor will make his first campaign appearance on behalf of the presumptive GOP nominee, an official with the Romney campaign confirms to CNN. Perry will be in Elko, Nevada to headline the opening of a Romney campaign field office. The former Massachusetts governor will not be at the event.
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Perry dropped out of the race for the White House in January, two days before the South Carolina primary. He then endorsed former House Speaker Newt Gingrich for the GOP nomination, but in late April he switched his endorsement to Romney shortly before Gingrich suspended his bid for the nomination in May.