The details about the newly-renovated space became public after White House gave a tour to reporters on Saturday.
Buying was also boosted by news that Trump had expanded the use of a coronavirus treatment using plasma from people who had recovered from the disease.
Robert Trump died in a New York hospital on Aug 15.
Biden's acceptance speech reflects the enormity of the shutdown that has upended life across the US in the battle against the deadly coronavirus.
Trump faced a barrage of criticism, most notably from former first lady Michelle Obama who said he lacks the character and skills for the job.
The couple along with their son Barron had been flying from New Jersey to Joint Base Andrews in Washington DC.
The "Lover" hitmaker also accused the POTUS of taking advantage of the COVID-19 crisis and requested her followers to vote early.
Analysts said there was little reaction to news that trade review talks between the superpowers due to have taken place Saturday had been postponed.
Sources had earlier described the president's younger brother Robert Trump to be "very ill".
Health experts remain adamant about the need for people to wear masks and maintain social distance to defeat a pandemic.
Michelle Obama is the co-chair of When We All Vote, a nonprofit organisation that aims to close the race and age voting gap.
Returning to the podium after the disruption, Trump appeared calm.
Trump denied having anything to do with helping the rapper get on the ballots for the upcoming presidential elections.
With key unemployment benefits, ban on evictions already lapsed for millions, Republicans and Democrats far apart in talks on a fresh economic rescue package.
With the disease showing no sign of easing globally -- total cases topped 18 million Monday -- governments are moving to reimpose containment measures.
Deborah Birx added that sticking to guidelines -- such as wearing a mask, maintaining personal hygiene and observing social distancing -- was crucial.
The garden was redesigned by Rachel Lambert Mellon and US first lady Jacqueline Kennedy in 1961.
Mary's book 'Too Much and Never Enough: How My Family Created the World's Most Dangerous Man' was released on July 14.
Reports said Mitch McConnell would soon unveil a $1 trillion plan after overcoming some differences with the White House.
'Too Much and Never Enough: How My Family Created the World's Most Dangerous Man', went on sale Tuesday.
Kanye West announced his decision to run for the Oval office on the occasion of US Independence Day on July 4.
The move threatens to further damage Britain's ties with China and costs huge for UK mobile providers that relied on Huawei equipment for nearly 20 years.