Democratic White House challenger Joe Biden blasted President Donald Trump as a conman during a campaign foray into traditionally Republican territory.
In Georgia, Mr Biden said that Mr Trump’s handling of coronavirus amounted to a “capitulation”.
Mr Trump kept blitzing the swing states that he won in 2016, warning in Michigan that its “economic survival” was on the line if Mr Biden won.
According to opinion polls, Mr Trump lags behind with a week to go.
But the race is tighter in critical battleground states such as Arizona, Florida and North Carolina.
More than 69 million people have already voted early by post or in-person in a record-breaking surge driven mainly by the coronavirus pandemic.
What did Trump say?
On Tuesday, Mr Trump held rallies in Nebraska and two states he snatched from Democrats in 2016: Michigan and Wisconsin.
In Lansing, Michigan’s capital, he warned: “This election is a matter of economic survival for Michigan.”
And he told suburban women, a demographic that many opinion polls suggest he is struggling to win over: “Your husbands, they want to get back to work, right? We’re getting your husbands back to work.”
Before leaving the White House, the president renewed his criticism of postal ballots – more than 46 million of which have been cast so far.
The huge volume of mail-in votes, which could take days or weeks to tally, means a winner is not certain to be known on election night next week.
“It would be very, very proper and very nice if a winner were declared on November 3, instead of counting ballots for two weeks, which is totally inappropriate,” Mr Trump told reporters before heading to the Midwest.
Mr Trump – who only this month was admitted to hospital with coronavirus – is planning a head-spinning 11 rallies in the final two days of the election campaign before voting day next Tuesday.
Meanwhile, First Lady Melania Trump joined the campaign fray solo for the first time on Tuesday, assailing Mr Biden as a “socialist”.
In the critical election state of Pennsylvania, Mrs Trump cast doubt on Mr Biden’s claims that he could do a better job as president.
“Well, the American people can look at Joe Biden’s 36 years in Congress and eight years in the vice-presidency and determine whether they think he’ll finally be able to get something done for the American people.”