Feeley is a former Marine Corps helicopter pilot.

According to US Department of State, which looks after American diplomats, Feeley resigned last month.

In his resignation letter, Feeley said, "As a junior foreign service officer, I signed an oath to serve faithfully the president and his administration in an apolitical fashion, even when I might not agree with certain policies."

"My instructors made clear that if I believed I could not do that, I would be honor bound to resign. That time has come," he added.

Feeley is not the first US official to quit his post under Trump regime.

In December, Elizabeth Shackelford, a State Department worker in Nairobi, put down her resignation papers.

She alleged that the US had abandoned human rights as a priority.