Justice Ruth Bader Ginsburg, a liberal stalwart, died Friday, opening a crucial vacancy on the court and setting off a fierce political battle before the 3 November vote.
Accounts targeted for heightened security include federal and state politicians; political parties; candidates; presidential campaigns, and journalists who cover them.
With less than seven weeks before the 3 November election, Joe Biden has ramped up his public appearances after spending large chunks of time at his Delaware home, even as Trump repeatedly barnstorms swing states.
In August, a 17-year-old with ties to arch-conservative groups was charged with shooting dead two people protesting against police mistreatment of blacks in Kenosha.
The contradiction between Trump and health experts on an issue that has become a focal point of the 2020 election campaign highlighted the lack of trust Joe Biden said he and the public have in the president's handling of the pandemic.
Only hours earlier, speaking to Fox News, US President Donald Trump had said a vaccine could come in 'four weeks, it could be eight weeks.'
This was Trump's first visit to California since the devastating blazes began there and in Washington and Oregon.
The Republican, who is down in the polls against Democrat Joe Biden and faces overwhelming disapproval from Americans on his handling of the coronavirus crisis, insisted that he'd softened the dangers in public so as to preserve calm.
Coming eight weeks before the 3 November presidential election, the revelations add new pressure on Donald Trump.
Some critics pointed to Trump's denigrating comments about late senator John McCain, who was captured in Vietnam and was widely regarded as a war hero.
Joe Biden's pick of California Senator Kamala Harris as his running mate, making her the woman of colour on a major party presidential ticket, fired up his donor base, raising $26 million in 24 hours, Biden revealed on 12 August.
Trump has largely overlooked the racial wounds caused by police use of force and played down the more than 180,000 US deaths from the coronavirus pandemic.
'The incumbent president is incapable of telling us the truth, incapable of facing the facts and incapable of healing.'
Anti-racism protests roiling US cities have become a major issue in the campaign for November's presidential election.
An array of officials and everyday Americans cited Trump’s efforts to loosen economic regulations, put “America First” in trade deals and support religious freedom as reasons to back him
Critics and even Trump’s allies dismissed the notion as an unserious attempt to distract from devastating economic news, but some legal experts warned that his repeated attacks could undermine his supporters’ faith in the election process.
Polls give his Democratic challenger Joe Biden an advantage nationally, strong leads in swing states, and even a shot at Republican strongholds like Texas.
After an erratic US response, some 140,000 deaths, and now dramatic surges in new cases across the south and southwest, polls show two-thirds of Americans mistrusting Trump's leadership on the issue.
