President Donald Trump really wants to fly on an upgraded Air Force One — but making that happen could depend on whether he’s willing to cut corners with security. As government lawyers sort out the legal arrangement for accepting a luxury jet from the Qatari royal family,

But the Air Force “believes” it will cost “less than $400 million to retrofit that aircraft,” service secretary Troy Meink said during a House Armed Services Committee hearing Thursday. Meink said the exact cost and details are classified.

The delay reflects lingering concerns over legal liabilities stemming from a White House maneuver to transform a sale between the U.S. and Qatar into a “gift.”