Gen. Dan Caine, chairman of the Joint Chiefs of Staff, and Adm. Frank M. Bradley, commander of the operation, met with members of Congress behind closed doors.
Republicans and Democrats released a two-year plan to scale back and extend expiring Affordable Care Act subsidies, but it faces long odds in the G.O.P.-led House.
Hearings that began Wednesday in Washington reflected anxiety over the future of the U.S.-Mexico-Canada trade pact and whether the president could end up scrapping it.
The person’s identity remained unclear for the moment, but the arrest could ultimately provide an answer to one of the mysteries arising from the Jan. 6. attack.