President Donald Trump grew impatient with how long it was taking to finish new planes to serve as Air Force One, so he started to look for other options.

Air Force Secretary Troy Meink told lawmakers on Thursday that it will “probably” cost the Air Force less than $400 million to retrofit a luxury Qatari plane that President Donald Trump has said he is getting from the Qataris as a gift to use as the new Air Force One.

It will cost hundreds of millions of dollars to retrofit a Qatari luxury Boeing 747 jetliner to fly as the new Air Force One, Air Force Secretary Troy Meink said.