He said Guard units are going through "constant mental repetitions of looking at the map and talking through scenarios with leaders so they understand their task and purpose, they know their routes, they know where they're friendly, adjacent units are, they have the appropriate frequencies to communicate with their law enforcement partners."
FBI vetting National Guard troops in D.C. amid fears of insider attack
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Defense and National Guard officials, including McCarthy, have said in interviews over the past several days they were told by D.C. that they believed the protests would be similar to the ones on Nov. 14 and Dec. 12.
FBI says it warned about prospect of violence ahead of riot
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