Trump, Biden continued to criticize each other in the sprint in Pennsylvania and Michigan, with only two days left to the election.

US President Donald Trump and Democratic candidate Joe Biden continue to call for support in key states in the industrial Midwest and southeastern US coast on October 31.

US President warned "risk of instability in the US" if there is no clear winner after the 3/11 election, saying that it will take weeks to sum up the results and "very bad things" could be

Trump focuses on Pennsylvania, the key battlefield state he describes as "the starting point of the story of American independence".

"It's time for Donald Trump to pack and go home," Joe Biden told a supporter in the state of Michigan, where Trump won a narrow victory in 2016. This is also his first appearance with the former general.

Vice President Mike Pence was campaigning in North Carolina, while Democratic Vice President Kamala Harris reappeared in Florida.

Pennsylvania is considered one of the most important battlefield states with both Republicans and Democrats in this year's election.

The US President's convoy was greeted by hundreds of people en route to the Bucks County.

Trump said that Biden would shut down Pennsylvania's fossil fuel industry, asserting that he created "the greatest economy in US and world history, while other nations were in free fall"

Biden and Obama held an unannounced campaign in Bloomfield Hills, before leaving for Detroit.

"This is not a competition to criticize the opponent. It is not a sporting event. This is a matter of survival," Obama said, adding that 140,000 Americans could have been saved if Trump took the same approach.

"We were fed up with the chaos, tweets, anger, failure and irresponsibility," Biden told a supporter.

Biden is ahead of Trump at 52% versus 42% in the national Reuters / IPSOS poll, partly due to public discontent with the President's handling of the pandemic.

The focus on Midwest states in the last days emphasizes the importance of this region.

Currently more than 90 million Americans have voted early, including 9 million in Texas, or 65% of all voters in 2016, according to data from the US Elections Project at the University of Florida on October 31.

The number of Democrats who vote early by mail is now higher, while the majority of Republican voters are expected to vote in person on November 3.

Polls now show that Biden is ahead of Trump among early voting voters.