Scarborough to Dems: Plan 2020 'campaign against Donald Trump, but expect' to run against Nikki Haley

MSNBC host Joe Scarborough on Wednesday repeated his theory that President TrumpDonald John TrumpREAD: Transcript of James Comey's interview with House Republicans Klobuchar on 2020: ‘I do think you want voices from the Midwest’ Israel boycott fight roils Democrats in year-end spending debate MORE might not be the Republican nominee for president in 2020, saying he thinks that outgoing U.S. Ambassador to the United Nations Nikki HaleyNimrata (Nikki) HaleyNikki Haley: 'Israel wants a peace agreement but it doesn’t need one' Showdown at the Security Council? North Korea evading US sanctions: report MORE could be the opponent Democrats should be preparing for in their bid to take back the White House.

“If I were actually wargaming this, I would tell everybody thinking about running, plan your campaign against Donald Trump, but expect to be running against Nikki Haley. You have to think that way.”

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Scarborough's co-host and wife, Mika Brzezinski, said the thought was “interesting” while co-host Willie Geist said, “We'll see.” 

"I like it," added Brzezinski.

Scarborough, a frequent critic of Trump, has often stated that he thinks Trump will either not seek a second term because of the Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE investigation or, if he does run for reelection, could be challenged in a GOP primary, possibly to Haley, who is leaving her U.N. post at the end of the year.

“How wonderful would it be for our daughters to see this woman — this daughter of immigrants — take a debate stage to coldly cut the Donald down to size, revealing to the world once and for all that this bloated emperor has no clothes?” Scarborough wrote in a Washington Post op-ed in April.

Polls have shown that Haley has widespread popularity among Republicans and Democrats.

A Quinnipiac poll from April, for example, found that 55 percent of Democrats approved of Haley's job performance as U.N. ambassador, with 75 percent of Republicans approving.

The Democratic number was the same as the percentage that approved of Democratic House leader Nancy PelosiNancy Patricia D'Alesandro PelosiIsrael boycott fight roils Democrats in year-end spending debate McConnell predicts no shutdown: Trump 'flexible' on border deal Ocasio-Cortez had highest percentage of small donors in midterms: report MORE (D-Calif.), who will become Speaker of the House again in January.