Biden, who is ahead in national polls but whose lead is tighter in all-important swing states including Pennsylvania, signaled he would share the stage with Trump in Shanksville if invited to do so.
Airline shares jumped on Trump's comments but then gave up some gains. American Airlines was up 1.5pc, while United Airlines was up 0.5pc in early afternoon trading.
The security assessment was prepared by staff at U.S. cybersecurity firm Cloudflare, which has been hired by President Donald Trump to help defend his campaign's websites
Beijing's move has called Trump's bluff on TikTok and opened up the possibility that the app could be sold to an American buyer to avoid a ban on its business in the United States
Culver City, California-based TikTok and its Chinese parent ByteDance Ltd rejected what they called the White House’s position that it was a national security threat, saying they had taken “extraordinary measures to protect the privacy and security of TikTok’s U.S. user data.”
Trump faces intense pressure to curb the contagion that has hobbled the world's largest economy and clouded his once-promising prospects for re-election in November.
Trump said that military considerations as well as oil projects and development were on the agenda for his meeting with Kadhemi, who took office in May.
Harris will likely aim to speak directly to millions of women, young Americans and voters of color.
Harris gained prominence in the Senate for her exacting interrogations of Trump nominees, Supreme Court Justice Brett Kavanaugh and Attorney General Bill Barr.
The situation in Belarus, a strategically important country that carries Russian energy exports to the West, is fluid after the biggest demonstration yet against his rule on Sunday.