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house. president biden's 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 confirmed white house chief of staff ron klain is expected to step down from his post in the coming w...

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. he's 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. on every sideline. >> like a medical exam room. made this a medical space even in middle of a very b...