The US president also says he is anxious to restart the economy as soon as he can.
Live BBC News coverage of the coronavirus pandemic and the latest advice.
Boris Johnson will continue to be closely monitored and is in "extremely good spirits", Downing Street says.
After Nevada, he was riding high. But then things began to unravel for him.
Global economic growth will turn "sharply negative" this year due to the pandemic, the IMF warns.
Taiwan rejects accusations by the UN health body's head that racist slurs against him originated there.
Zookeepers are taking special measures to protect endangered clouded leopard cubs from Covid-19.
Italian PM Giuseppe Conte said he might begin to relax some measures by the end of this month.
Five Easter-egg sized decorated ostrich eggs in the British Museum are the subject of a new study.
The Federal Reserve unveils more measures to shore up the economy as weekly jobless claims hit 6.6 million.
The country's unemployment rate rose to 7.8% as non-essential business closed due to the coronavirus.
Traditional fanfare is abandoned as a team head for the International Space Station.
EU finance ministers reached the deal after marathon talks in Brussels.
The group will cut production by 10 million barrels a day from May to combat a fall in demand.
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