State capitals nationwide bracing for possible violence in wake of attack on U.S. Capitol By Adam Brewster States securing capitols amid threats of protests In Madison, Wisconsin, some windows at the Capitol are boarded up. In Phoenix, there is fencing surrounding the Arizona Capitol. Multiple states have activated or are planning to activate National Guard members. America's capital cities are bracing for possible unrest after last week's assault on the United States Capitol. The FBI is warning law enforcement across the country that groups are calling for the "storming" of federal, state and local courthouses in all 50 states if President Trump is removed from office prior to Inauguration Day on January 20, a law enforcement source told CBS News.