US President Donald Trump said the Qatari-donated jet that has served as Air Force One will be sent for upgrades, as concerns mount over the plane’s security features.

Stepping off the plane on his return from the FIFA World Cup final in New Jersey on Sunday, Trump was asked about the newly renovated plane’s missile-defense capabilities.

“It has a lot of capability but, as I understand it, in about a month or so they’re going to send it to have it be maxed out,” Trump told reporters at Joint Base Andrews.

“They’re going to be sending it, and they’ll have it be maxed out. It’ll take about a month,” he added.

As CNN has reported, concerns about the new, $400 million Qatari-gifted jet have come into focus since earlier this month when Trump unexpectedly ditched the jet during his return from a NATO summit in Turkey and said he was sending the new plane ahead to Mildenhall air base in England.