Biden yashyizeho umuyobozi wa White House Hagati aho, Prezida Donald Trump yari yitavye inama ku kirimba iwe kuri White House/Maison Blanche, yerekeye umugambi ku rucanco rwa Covid-19 wiswe 'Operation Warp Speed', akaba yashimagije ingene urwo rucanco rugiye kwemezwa.
