Former Trump campaign adviser Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE said in a recent interview that he would run a challenger against Vice President Pence should Pence run for the Oval Office in 2020.

Stone told the conservative website Big League Politics that he doesn’t believe it’s a guarantee 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 will run for a second term. Stone said Trump could decide to retire from politics if he accomplishes his agenda in the first four years.

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“I could see him saying ‘You know what? I don’t need this anymore. I’ve made America great again. I have kept my promises to the American people. I’m heading off to the golf course,’” Stone said of Trump to the online web show "Howley Reports."

Stone also said he could “guarantee” that he’ll run a candidate against Pence should Trump bow out.

“Mike Pence Michael (Mike) Richard PenceButtigieg stands in as Pence for Harris's debate practice Trump argues full Supreme Court needed to settle potential election disputes Pence adviser knocks ex-staffer who criticized Trump on COVID-19 MORE is not one of us,” Stone said. “Mike Pence is controlled by the Koch brothers, who did everything humanly possible to stop Donald Trump from being president,” he added, referring to billionaire conservative donors David and Charles Koch.

Stone also dismissed United States Ambassador to the United Nations Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE as a potential 2020 candidate.

“See you in New Hampshire, boys,” Stone said to a potential presidential ticket that includes Pence and Haley.

Trump earlier this year announced that former digital adviser Brad Parscale would be his campaign manager for 2020.