Members of the Senate Intelligence Committee demanded classified briefings Tuesday over reports that US agencies could not independently corroborate Israeli intelligence describing plots against President Donald Trump. The requests followed reporting that the assessments prompted a secret change to the president's aircraft.

US intelligence officials could not verify the underlying threats, according to people familiar with the assessments cited in initial reporting. Democratic committee members, led by Vice Chair Mark Warner of Virginia, said the reliance on foreign intelligence to shape presidential security warranted oversight.

Republican members have questioned the sourcing of the reports and defended the Secret Service's protective decisions as prudent. The Office of the Director of National Intelligence and the Secret Service declined to detail specific protective measures, citing operational security.

A White House spokesperson said the president's security arrangements were determined by professionals and dismissed suggestions of foreign influence over decision-making. The dispute adds to tensions between the administration and lawmakers over intelligence-sharing with Israel, a recurring point of friction as Congress weighs oversight of the executive branch's national security apparatus.