individual invitations to each of the living presidents. instead t will be one invitation to the united states and president biden will ultimately make that decision, but the white house, they're still waiting on the formal invitation and then they'll make those decisions. >> tough decisions to make there. kaitlan collins at the white house, thank you so much. >> much of life across the united kingdom was on pause today. as britain enters an official period of mourning. major stores and the london zoo are closed, sporting events have been postponed. concerts and awards ceremonies delayed. matthew chance is outside buckingham palace in london and you have been speaking to mourners there all day. what has been their message? >> yeah, it's incredible. in fact, you join me now, jake, right at the gates of buckingham palace. you can see th l this, you know, sea of bouquets of flowers that have been laid by the thousands upon thousands of people that are thronging