They include several officials with whom Biden worked when serving as vice president to Barack Obama.
（REUTERS/Loren Elliott/File PhotoTwo dozen players who arrived from Los Angeles entered strict hotel quarantine after an aircrew member and Australian Open participant who is not a player tested positive for the new coronavirus.making Pence the acting president.
還Pennsylvania and Washington are among the states that have activated their National Guards to strengthen security.
國Trump on Sunday kept up his unsubstantiated allegations of widespread electoral fraud.
個Trumps strategy for retaining power is focused increasingly on persuading Republican legislators to intervene on his behalf in battleground states Biden won.
Maduro has said Venezuela will shortly receive 10 million doses of Russias Sputnik V vaccine.