President Trump’s new version of Air Force One will be limited by the presidential passenger jets’ inability to be refueled while in flight, Gen. Joseph Dunford, the chairman of the Joint Chiefs of Staff, said on Tuesday.

The decision to forgo the in-flight refueling capability was made by the White House and not the Air Force as a way to save money, Dunford told the Senate Armed Services Committee during a hearing for his reappointment as the nation’s top military officer and the president’s military adviser.