Mr Kushner’s quiet undertaking of such high-profile meetings has raised national security concerns from military and intelligence officials, who said the president’s son-in-law was “undermining US authority” in the region.

Naveed Jamali — a former US Defence Department intelligence officer and double agent — told The Independent the Trump administration has frequently “blurred the lines of communication” between government agencies by sending Mr Kushner to meet with top international officials.

“We know there is a flawed system by the fact that Jared Kushner has a security clearance,” Mr Jamali — who has launched a bid for political office — said on Thursday, noting the 38-year-old adviser’s omission of Russian contacts from his initial clearance application and foreign business assets that would typically bar an official from receiving a clearance.

Mr Jamali added, “Who speaks for the government, the institutions or the family of the president?”