Four ex-Capitol security officials are expected to be grilled by senators about the riot response failings. Watch on NBC News NOW.

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Feb 23, 2021 Four ex-Capitol security officials are expected to be grilled by senators about the riot response failings. Watch on NBC News NOW. Four key Capitol security figures will face tough questions from senators on Tuesday about how the highly secure facility was breached during the Jan. 6 riot. Three of the officials testifying resigned over their role in the response: Steven Sund, who was the chief of the Capitol Police; Michael Stenger, who was the Senate sergeant-at-arms, and Paul Irving, who was the House sergeant-at-arms. Robert Contee, the acting chief of the Washington, D.C., police, is also testifying.The hearing is expected to focus on why officials weren't better prepared for the attack and why it took so long to quell the mob. Watch the hearing live on NBC News NOW. Read More Get the NBC News Mobile App Follow NBC News Check out all of NBCNEWS Newsletters here. Update Preferences | Unsubscribe | Contact | Privacy Update Preferences Unsubscribe Contact Privacy