>> you're looking live now, president biden will soon deliver the keynote address of the 40th annual peace officer's memorial service. it's an event hosted by the national fraternal order of police and honors the 491 law enforcement officers who lost their lives in the line of duty during 2019 and 2020 and he's being introduced now by james smallwood, the national treasurer for the fraternal order of police. the president earlier today ordering that all flags on federal buildings and public buildings to be flown at half staff to honor their service and sacrifice. it is an interesting moment as we tragically have been reporting on what happened in houston. the ambush of three constable