The lawmakers used Waltz's nomination hearing for U.N. ambassador to resurrect criticisms of the handling of sensitive Signal chats.

Sen. Cory Booker, D-NJ, criticized Waltz’s inability to take accountability. Booker said Waltz “denied” and “deflected” rather than own up to his mistakes, something the New Jersey senator said is a “failure of leadership.” He called Waltz’s actions a show of “profound cowardice.”