U.S. President Donald Trump returned from Turkey aboard the older Air Force One after American authorities received Israeli intelligence about a possible threat to his life. One factor in the decision was that the new aircraft gifted to the United States by Qatar was deemed by security officials to be insufficiently equipped, The Wall Street Journal writes, citing U.S. officials.

According to the sources, the threat was not considered fully confirmed, but combined with the worsening situation surrounding Iran and the risk of retaliatory actions against American allies in the region, the U.S. Secret Service, the White House Military Office, and National Security Council staff concluded that the new aircraft was not suitable for transporting the president under the current circumstances.

Trump used the upgraded Qatari aircraft during his trip to the NATO summit in Ankara. However, on the return journey he switched to the older Air Force One, first heading to the United Kingdom and then flying from there to Washington on the new aircraft.

The U.S. president dismissed reports that the change of aircraft was related to a security threat. According to him, the plane was sent to the United Kingdom so that the U.S. military could inspect it. Asked about a possible threat from Iran, Trump said he faces threats “constantly” and is the “main target” for America’s adversaries.

Earlier, The Wall Street Journal reported that Israel had passed intelligence to Washington about a possible new Iranian plot to assassinate Trump. At the same time, some U.S. officials expressed concern that such information may have been used to pressure Washington into resuming the military campaign against Tehran.

A representative of the Israeli embassy said that intelligence sharing with the United States is part of the close cooperation between the two countries and is not connected to attempts to influence U.S. policy.

The new aircraft was transferred to the United States by Qatar after Trump had previously criticized the current Air Force One planes for their age and lack of comfort. The aircraft underwent upgrades by the U.S. Air Force, but the exact defensive capabilities of presidential aircraft remain classified.

Former U.S. Air Force Secretary Frank Kendall had previously noted that fully installing all necessary protective systems on a large passenger aircraft can take several years. According to him, turning an ordinary plane into a full-fledged presidential aircraft requires major engineering changes.

Amid ongoing tensions with Iran, U.S. officials believe that Trump may use the new aircraft less frequently for foreign trips in the future.