MSNBC host Joe Scarborough on Wednesday repeated his theory 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 might not be the Republican nominee for president in 2020, saying he thinks that outgoing U.S. 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 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.”

ADVERTISEMENT

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 Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout 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 Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.), who will become Speaker of the House again in January.