A U.S. military plane with migrants bound at their wrists and ankles has left Texas bound for Guatemala carrying 80 deportees, eight of them children.

U.S. military and police forces began the first deportation flights for illegal immigrants under President Donald Trump's hardline immigration crackdown nationwide and particularly at the southern border.

The Trump administration has enlisted the US military to quickly scale up its deportation capacity, which usually relies on charter flights.

A U.S. Air Force jet with migrants bound at their wrists and ankles departed Texas for Guatemala on Thursday, carrying 80 deportees in another deportation flight that reflects a growing role for the armed forces in helping enforce immigration laws.