Mexico has refused a request from President Donald Trump’s administration to allow a U.S. military aircraft deporting migrants to land in the country, a U.S. official and a Mexican official told Reuters.

White House press secretary Karoline Leavitt said early Friday morning deportation flights had begun, marking the first deportation flights using military aircraft since President Dwight Eisenhower was in office, Reuters reported, citing an unnamed U.S. official.

Mexico refused to allow a US military plane with migrants on board to land on its territory. This was reported by NBC with reference to two representatives of the US Department of Defense and a source familiar with the situation.