Walker, the commanding general of the D.C National Guard, is a decorated veteran guardsman and former DEA special agent.
Levine was nominated by Biden to serve as assistant secretary for health in the Department of Health and Human Services.
Levine is poised to become the first openly transgender federal official to be confirmed by the U.S. Senate.
Dr. Rachel Levine decries incidents perpetuating "a spirit of intolerance and discrimination" as she focuses on COVID-19.
Keystone State officials say Dr. Rachel Levine, who is transgender, is owed an apology after a local fair used a man in a dress to impersonate her in a dunk tank.