Over 80 per cent of the American population is under lockdown after four more states implemented stay-at-home directives in the fight against coronavirus.
The orders were introduced in Florida, Georgia, Mississippi and Nevada, as the death toll crossed more than 5,000 nationwide.
US President Donald Trump, however, dismissed the need to impose a nationwide lockdown as 39 states and the District of Columbia have already introduced stay-at-home directives.
He also added that a plan to halt flights to coronavirus hot spots are being considered.
This comes as medical experts forecast the death toll could touch anywhere between 100,000 to 240,000 over the next couple of months.
So far, the country has more than 215,000 confirmed cases and 8,800 recoveries.
King Salman will undergo a treatment programme at Al Salam Palace in Jeddah for a lung inflammation, the state news agency said on Sunday, hours after he underwent medical tests.
Israeli troops and tanks pushed on Saturday into parts of a congested northern Gaza Strip district that they had previously skirted in the more than seven-month-old war, killing and wounding dozens of Palestinians, medics and residents said.
Slovak Prime Minister Robert Fico is no longer in immediate danger but still in a serious condition, his deputy said on Sunday, four days after an assassination attempt that sent shockwaves through Europe.