US and British intelligence agencies are able to gain access to personal data from smartphone apps including Angry Birds and social media sites such as Facebook and YouTube, according to documents taken by ex-US spy contractor Edward Snowden.
White House spokesman Jay Carney said US surveillance agencies were only interested in collecting data on people considered a threat to the United States.
Mr Carney told a regular White House news conference:
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.