Trump flew out of Turkey on Wednesday night on the old Air Force One instead of his new Qatari-donated Boeing 747-8 as a security precaution related to the resumption of hostilities with Iran, according to people briefed on the plans, who said the change came at the urging of the Secret Service.

The swap deepens questions about whether the new plane, which the president had pressed to be ready as soon as possible, was retrofitted with sufficient security measures over the last year. Lawmakers and some officials have raised concerns about whether the expedited timeline allowed for the addition of an advanced missile defense system and other modifications used to protect the president.

In a statement, Steven Cheung, the White House communications director, said that “the new Air Force One is a state-of-the-art aircraft that has been fitted with high-level security protocols that ensure the safety of the president and his staff.”