The World Health Organization says it is temporarily halting its clinical trials that use hydroxychloroquine to treat COVID-19 patients over published concerns that the drug may do more harm than good.

The move comes after the medical journal The Lancet reported on Friday that patients getting hydroxychloroquine were dying at higher rates than other coronavirus patients.

Former Vice President Joe Biden, the presumptive Democratic nominee for president, made an unannounced visit to the Veterans Memorial Park in New Castle, Del., on Monday.

It's the first time Biden has left the area around his home in Wilmington, since mid-March when he began self-isolation amid the coronavirus pandemic.

He and his wife Jill Biden, both wearing black masks, placed a wreath before a memorial wall commemorating war veterans from Delaware and New Jersey.

Even in a typical year, Memorial Day in the U.S. can be a confusing mixture of joy and sadness — at once a hearty welcome to summertime, brimming with picnics and parties, and a somber remembrance of the service members who died in wars.

But this has been no typical year.

As Americans observe a subdued Memorial Day, President Trump visited Fort McHenry in Baltimore to remember those soldiers who have fallen in service of the country.

"I stand before you at this noble fortress of American liberty to pay tribute to the immortal souls who fought and died to keep us free," Trump told the crowd, which included the several members of his Cabinet. "We pledge in their cherished memories that this majestic flag will proudly fly forever."