Jared Kushner, President Donald Trump's son-in-law and top adviser, has lost his access to the nation's most tightly-guarded intelligence report - the President's Daily Brief.

Two officials familiar with the matter told Reuters Kushner had been cut off from viewing the report in the past few weeks - part of a White House clampdown on who can see the nation's secrets.

Kushner, among others at the White House, has been working for more than a year under an interim clearance, pending the completion of a full background check.

Another Reuters source said Deputy Attorney General Rod Rosenstein recently passed new material to the White House that led to the slowing or stopping of Kushner's pending application for permanent security clearance.

Kushner's top clearance could be reinstated if his application is eventually approved - or if President Trump decides to restore it - but last Friday Trump told reporters he would leave that decision to his chief of staff.

Kelly last week said he believed Kushner would be able to hold onto his crowded foreign policy portfolio, which has included Trump's push for an Israel-Palestinian peace deal.