Mitt Romney's campaign on Wednesday announced that it had hired Richard Grenell, an openly gay man, as its national security and foreign policy spokesman.

Gay weekly Metro Weekly reported that Grenell served as the spokesman for the U.S. ambassador to the United Nations during the George W. Bush administration and publicly came out gay as he left his post in an interview with gay glossy The Advocate.

Grenell and his partner, Matt Lashey, have been together roughly 10 years.

R. Clarke Cooper, executive director of gay GOP group Log Cabin Republicans, told Metro Weekly that Grenell will be “a tremendous asset” to the campaign.

“Having served with Ric, I can attest that his experience in the multi-lateral environment of the UN and familiarity with domestic and internal media make Ric a strong voice,” Cooper said.

Grenell told The Advocate that the State Department refused to list his partner in the United Nations' Blue Book, a reference guide of diplomatic personnel and their spouses. The administration told him at the time that the Defense of Marriage Act (DOMA) barred the listing. Grenell and Lashey, who live in California, are not married.

(Related: Mitt Romney to deliver commencement at anti-gay Liberty University.)