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house. president bidens chief of staff ron klain stepping down. departure comes at a challenging time with a special counsel investigation into handling of classified documents and possible re-election campaign. right to the arlette saenz joining us from delaware where president biden is spending the white house. a little bit of news at the white house this saturday afternoon. tell us more. >> reporter: jim, marking a significant change in leadership apartment the white house as cnn co...

Players will be active there has to be an emergency action plan. >> administering cpr. >> followed to a letter that night. in in a moment everyone knew what they needed to do how to do it had equipment to do it and felt comfortable. >> reporter: dr. alan sails is chief medical officer of the nfl. hes given me a sideline view of the preparedness that goes into every game day. once you see this, you will probably never watch a game the same way again. they may have missed this. pop-up blue tent. o...