The Office of Management and Budget has ceased allowing members of Congress to use government aircraft to travel during the partial shutdown, CBS News reports.

"Under no circumstances during a government shutdown will any government owned, rented, leased, or chartered aircraft support any congressional delegation, without the express written approval of the White House chief of staff," Acting OMB Director Russell Vought told leading officials of executives services in a memorandum on Friday.

On Thursday, President Donald Trump notified House Speaker Nancy Pelosi, D-Calif., that she could not use a military plane for a congressional delegation to Brussels, Egypt and Afghanistan, claiming it was “due to the shutdown.” Trump notified Pelosi in a letter that revealed the trip, which had been a closely guarded secret since the speaker would have been headed into a war zone.

Pelosi’s spokesman, Drew Hammill, tweeted Friday that "In the middle of the night, “State Dept's Diplomatic Security Service provided an updated threat assessment detailing that the President announcing this sensitive travel had significantly increased danger to the delegation & to the troops, security & other officials supporting the trip.”