Openly gay foreign policy wonk Richard Grenell is expected to be President-elect Trump's choice for U.S. ambassador to the United Nations.

Grenell was previously spokesman for four US ambassadors to the UN under President George W. Bush.

He was briefly Mitt Romney's advisor on national security and foreign affairs during the 2012 presidential race but resigned abruptly, reports The New York Post, allegedly over concerns over his sexual orientation.

Grenell has been critical of President Obama's nuclear deal with Iran and the failure of Secretary of State Hillary Clinton to put Boko Haram on the terror list.

But though a registered Republican and commentator on Fox News, he's also spoken out on LGBT rights. In 2013, he signed an amicus brief submitted to the Supreme Court in support of same-sex marriage.

During the Bush administration, he pushed unsuccessfully to have his partner, Matt Lashey, listed as his spouse in the United Nations’ Blue Book.

“What put me over the edge was a friend and colleague who met her spouse after I was already with my partner," he said at the time. "They got married and subsequently were put into the Blue Book in a matter of days."

Samantha Power, the country's current ambassador to the UN, has been a staunch ally to the international LGBT community.

“LGBTI rights and the rights of migrants are among the most pressing human rights issues of our time,” she said in June. “LGBTI rights are human rights. LGBTI rights are essential rights — end of story.”