President Donald Trump says he is considering buying used Boeing aircraft — perhaps from an overseas seller — to use as Air Force One when he’s aboard, as he fumes over the U.S. plane-maker’s delays in producing two specially modified ones for presidential use.

Among the ways being discussed to force faster delivery of two presidential planes are relaxing security clearances for Boeing workers and even purchasing a temporary luxury plane and retrofitting it.

President Donald Trump toured a Boeing plane on Saturday to highlight delays in delivering new Air Force One aircraft, said the White House. The president negotiated with Boeing for a pair of new 747-8 aircraft during his first administration - between 2017 and 2021 - but the planes are now years behind schedule.