NEW: Vice President JD Vance praises outgoing White House Press Secretary Karoline Leavitt as “one of the most effective voices” defending President Trump’s age

NEW: Vice President JD Vance praises outgoing White House Press Secretary Karoline Leavitt as “one of the most effective voices” defending President Trump’s agenda, crediting her with taking on relentless media scrutiny throughout her time in the role. Vance also pointed to the demands of serving i…