Sergeant at Arms of the United States House of Representatives

[CTAtheist]

(a) Law enforcement authority
The Sergeant at Arms of the House of Representatives shall have the same law enforcement authority, including the authority to carry firearms, as a member of the Capitol Police. The law enforcement authority under the preceding sentence shall be subject to the requirement that the Sergeant at Arms have the qualifications specified in subsection (b).

https://www.law.cornell.edu/uscode/text/2/5605

Can Congress Jail Witnesses Who Refuse to Cooperate?
<snip>
But, just because there’s no physical jail doesn’t mean there’s no right for Congress to detain individuals — and in fact the Capitol Police do maintain a holding cell a few blocks away.

http://time.com/5023920/trump-russia-election-congress-capitol-jail/


Just sayin'