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 reportedly denied access to land for a U.S. military plane that was slated to return deportees to the country, according to reports.