Former White House chief of staff Reince Priebus Reinhold (Reince) Richard PriebusLeaked audio shows Trump touted low Black voter turnout in 2016: report Meadows joins White House facing reelection challenges Trump names Mark Meadows as new chief of staff MORE warned in an interview that aired Sunday that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE needs to repeat his success in Michigan, Pennsylvania and Wisconsin in 2020 to win reelection.

Priebus told AM 970's "The Answer" that the president's path to victory in 2020 requires reigniting the support he received in working-class communities across the Rust Belt.

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"[Trump] has to win Wisconsin and Michigan," Priebus told host John Catsimatidis. "We have to win Pennsylvania."

"We’re likely to have a battle in Arizona, which is new for the Republican Party. I think we have to be very careful in Georgia," he continued.

The former White House aide and Republican National Committee chairman went on to add that current Democratic front-runners such as Sens. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) and Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) would have trouble winning over working-class voters but that former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE would be more successful.

"I think Joe Biden would be a tough candidate in spite of these recent troubles he’s having. I think he’d be a tough candidate for the Democrats," he said.

"But other than that ... these guys are going to have a hard time in Wisconsin and Michigan and Pennsylvania. I don’t see them resonating on top of this universal health care talk and talk about socialism and free everything," he said." This just isn’t going to work for them."

Priebus, who was replaced by former chief of staff John Kelly John Francis KellyMORE, has remained a vocal supporter of the president and his administration since leaving the political sphere.

In December, it was reported that he had received a recommendation to be commissioned into the Navy by then-Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE, who has since left the Trump administration as well.