From Lisa Mei: Regarding the US Marshalls w/Pelosi...
U.S. Capitol Police:
Every single individual in Congress that holds leadership positions, including the speaker of the House, House minority leader, Senate president pro tempore, Senate majority and minority leaders as well as the whips in those chambers, receives personal protection from the U.S. Capitol Police.
Sauce:
https://abcnews.go.com/Politics/protecting-us-government-leaders-security-analysis/story?id=66258938