When Leavitt, 27, walks out into the James S. Brady Press Briefing Room on Tuesday, she'll be the youngest press secretary to do so, since Ronald Ziegler, who held the title in former President Ronald Reagan's White House at age 29.

The grant pause is perhaps most similar to a federal government shutdown, when a congressional impasse on spending legislation delays federal payments for some state and local services.

Karoline Leavitt used her first briefing in the role to warn veteran reporters that they were increasingly irrelevant.