President Trump's national security team was blindsided by his speech last month to NATO leaders that did not reaffirm a key NATO provision, Politico reported.

Trump reportedly disappointed and surprised his own top staff when he did not reaffirm the Article 5 provision during his speech — a measure that was supported by national security adviser H.R. McMaster, Defense Secretary James Mattis and Secretary of State Rex Tillerson.

The officials reportedly thought that language was included in the speech ahead of its delivery, only realizing a change had been made when Trump spoke.

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“They had the right speech and it was cleared through McMaster,” a source briefed by National Security Council officials told Politico in the immediate aftermath of the NATO meeting. “As late as that same morning, it was the right one.”