Trump was also criticised by his own infectious diseases expert over mask-wearing. Both candidates head to the key battleground state of Florida on Thursday.
The leaders of US tech giants faced strong criticism from US senators on Wednesday over the way they moderate content on their platforms.
With under a week to go until the vote, the Democratic challenger was in Georgia while the president is on a whistlestop tour of several Midwestern states.
Police say officers shot Walter Wallace, 27, when he ignored orders to drop a knife. His family say he was experiencing a mental health crisis.
Electricity firm Southern California Edison reported to regulators that it was investigating whether its equipment might have sparked the Silverado Fire near the city of Irvine.
The government’s lawyers argued that the United States could step in as the defendant because Trump was forced to respond to the lawsuit to prove he was physically and mentally fit for the job.
An electricity firm says its equipment may have caused a wildfire which forced mass evacuation orders and injured two firefighters.
The discovery of reserves of ice water on the Moon could mean future lunar bases will be able to access drinking water.
The boy's costume matched the president's outfit almost exactly, even down to the red tie.
Jamie Margolin on planning for the future in the midst of a climate crisis.
Any presidential election in the United States America is bound to divide Americans, but it seems like the country is more divided than ever. And getting there has taken years. But how did it happen? And how does America get out of it?
Donald Trump is expected to hit nearly a dozen states in the final week of campaigning as he tries to recover ground from his Democratic rival.
The historic - though largely symbolic - treaty will apply from January 2021. Nuclear powers US, Russia, China, UK and France have not signed.