White House press secretary Karoline Leavitt made her briefing debut on Tuesday, where she sparred with reporters over a federal freeze on grants and made clear that President Donald Trump himself will be the administration's main messenger.

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.