Speaking on Air Force One just hours after Kremlin spokesman Dmitry Peskov curtly confirmed Putin would not attend, Trump turned prickly when talk turned to the Russian leader. The president had just left Qatar and was headed for the United Arab Emirates when he fielded questions on the presidential aircraft.

Boeing was supposed to deliver a replacement for Air Force One last year, but significant delays have cost the plane maker billions on the project. They have also drawn ire from the president, who told reporters aboard Air Force One in February that he was “not happy with Boeing” and may purchase a plane elsewhere.

Upgrading a Qatar-donated 747 into a new Air Force One would take a large sum of money and years to complete, aviation experts said.

President Donald Trump defended Qatar gifting the U.S. a jet to use as Air Force One as the new fleet is still under construction.