The transition tabletop exercise was chaired by Homeland Security Adviser Liz Sherwood-Randall ... Biden's outgoing Cabinet for the two-hour session. The exercise has been a key part of ...

National security officials in previous administrations have characterized the exercise, which is a required part of the presidential transition ... Liz Sherwood-Randall, Biden’s homeland ...

President Joe Biden is deploying 1,500 additional active-duty troops ... President Andrés Manuel López Obrador and U.S. Homeland Security Advisor Dr. Elizabeth Sherwood-Randall met in Mexico City where they ultimately agreed on a set of additional ...