Former Wisconsin Gov. Scott Walker (R) called Democratic presidential candidates 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 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 “wannabe socialists” in an interview that aired Sunday. 

Speaking with radio host John Catsimatidis on AM 970’s “The Answer,” Walker implied that Democratic candidates including Biden, Warren and Sen. 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.) would mess up the economy if they’re won the presidency. 

“Middle class working America were big winners under this presidency and it’s why the last thing you want to do is screw it up and put a socialist like Bernie Sanders or other…wannabe socialists like Elizabeth Warren or Joe Biden in,” Walker said. 

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Biden, Warren and Sanders are considered the frontrunners in a crowded 2020 Democratic presidential field. Sanders has described himself as a democratic socialist but the others have not done so.

Warren said in March that it would be “wrong” to call her a socialist. 

Walker ran unsuccessfully for the Republican presidential nomination in 2016 and his gubernatorial reelection bid last year.