President-elect Joe Biden introduces key foreign policy and national security nominees and appointments at the Queen Theatre in Wilmington, Del., on Tuesday.

WILMINGTON, DE – NOVEMBER 24:  President-elect Joe Biden (C) introduces key foreign policy and national security nominees and appointments at the Queen Theatre on November 24, 2020 in Wilmington, Delaware. As President-elect Biden waits to be approved for official national security briefings, the names of top members of his national security team are being announced to the public. Calls continue for President Trump to concede the election and let the transition proceed without further delay. (Photo by Mark Makela/Getty Images)