President TrumpDonald John TrumpSenate advances public lands bill in late-night vote Warren, Democrats urge Trump to back down from veto threat over changing Confederate-named bases Esper orders ‘After Action Review’ of National Guard’s role in protests MORE is concerned about the prospect of running against former Vice President Joe BidenJoe BidenHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Trump finalizing executive order calling on police to use ‘force with compassion’ The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook MORE in 2020, fearing that he is the Democrat most capable of reaching his base of white working-class voters, Axios reported Wednesday.

Advisers to the president tell Axios that Biden, 75, is seen as the potential Democratic challenger to Trump most likely to put up a fierce fight in states that Trump won in 2016, like Pennsylvania, Michigan and Wisconsin.

Trump also considers Biden a potential threat because of what he sees as an otherwise weak set of rumored challengers, like Sens. Bernie SandersBernie SandersThe Hill’s 12:30 Report: Milley apologizes for church photo-op Harris grapples with defund the police movement amid veep talk Biden courts younger voters — who have been a weakness MORE (I-Vt.) and Elizabeth WarrenElizabeth WarrenWarren, Democrats urge Trump to back down from veto threat over changing Confederate-named bases OVERNIGHT DEFENSE: Joint Chiefs chairman says he regrets participating in Trump photo-op | GOP senators back Joint Chiefs chairman who voiced regret over Trump photo-op | Senate panel approves 0B defense policy bill Trump on collision course with Congress over bases with Confederate names MORE (D-Mass.), Axios reported.

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To be sure, Biden has not said yet whether he intends to challenge Trump in 2020. But he has repeatedly been floated as a potential contender and has left the door open to a presidential bid.

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Biden, a former senator from Delaware, has long touted his hometown of Scranton, Pa., as a symbol of his working-class upbringing. 

That could ultimately make areas of Pennsylvania outside of Philadelphia and Pittsburgh more competitive. Trump campaigned fervently across the state in 2016 and relies heavily on support from more suburban and rural areas, Axios reported. 

The news outlet reports that Biden will wade more heavily into electoral politics in the fall by appearing with candidates across the country on a weekly basis and issuing a series of endorsements.