Trump campaign in a frenzy over possible 2020 loss of Rust Belt states that put him in the Oval Office

As President Donald Trump's re-election bid gears up, he might be more vulnerable than ever in the three rust belt states that helped put him in the White House.

Bloomberg reports that with Bernie Sanders and Joe Biden in the race -- candidates who tend to poll well among white working-class voters -- the President might be more vulnerable than ever in Pennsylvania, Wisconsin and Michigan, states that helped swing the 2016 election in his favor.

As Bloomberg notes, "his Rust Belt focus is an acknowledgment that he may spend much of the 2020 campaign on defense, depending on the strength and appeal of his eventual Democratic challenger."

A poll released earlier this months revealed that 46 percent of Wisconsin voters said they'd vote for someone other than Trump.

David Canon, a professor of American politics at the University of Wisconsin in Madison, told Bloomberg that the Trump die-hards who go to his rallies no longer reflect a large voting block.

“He still has his Trump base in Wisconsin and all around the county, and these are the people who come for the rallies,” Canon said.

“But it’s a relatively small percentage of the overall electorate right now in Wisconsin.”

Read the report here.