Mr Biden has led in every national poll against Mr Trump about the outcome of the US election since September last year. According to the most recent polling from RealClearPolitics, the Democrat nominee leads the incumbent President by 10.2 percentage points. But Steve Cortes, an adviser to Mr Trump, has said polling favouring the former Vice President is biased towards Democrats.
Speaking to Fox News’ Bill Hemmer, Mr Cortez claimed Mr Biden is enjoying a lead in the polls because of Democrat’s being over-represented in surveys.
He said: “I think polls matter. We pay some attention to them.
“It’s very critical to look at the inputs because the inputs often determine the final output numbers.
“Many of these polls have massive oversampling of Democrats.”
Mr Cortez added Mr Trump is currently seeing an upswing in national polling due an “economic renaissance”.
Due to the coronavirus pandemic, the US economy plummeted, but in third quarter of the fiscal year it grew by more than 30 percent.
Mr Cortez also stated Trump voters across the country are less likely to declare support for the President due to “cancel culture”.
He also said state and the Republican’s internal polling is showing a close race in the month leading up to the election.
But while Republicans may be concerned about national polling, Mr Biden has sought to downplay them.
Laura Hubka, ultrasound technologist and chair of Howard county Democrats, said she doesn’t want “to believe any” of the national pills over 2016’s results.
Mrs Clinton was leading Mr Trump by a wide margin in polling throughout the year, but ultimately lost the election to the Republican.
She said to the Guardian: “I do think that there’s a few people that may have been making excuses for Trump who feel a little more ashamed or a little more like they might vote for Joe Biden.
“But sitting where I live, I don’t feel like there’s a 14-, 15-point lead. He’s not ahead by that.”
The election takes place on November 3, with both candidates ramping up appearances ahead of the vote.
Mr Trump is set to return to the campaign trial today at Sanford, Florida.
He will also be making appearances this week in Greenville, North Carolina and Johnstown, Pennsylvania.
The President had to cancel a series of events after being hospitalised with coronavirus earlier this month.