Fox News host Tucker Carlson Tucker CarlsonJudge tosses Karen McDougal's defamation suit against Tucker Carlson OVERNIGHT ENERGY: House passes sweeping clean energy bill | Pebble Mine CEO resigns over secretly recorded comments about government officials | Corporations roll out climate goals amid growing pressure to deliver Former Florida attorney general calls Kyle Rittenhouse 'a little boy out there trying to protect his community' MORE on Monday speculated that former President Obama has not backed his former vice president, Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, in the 2020 presidential race because his wife, Michelle Obama Michelle LeVaughn Robinson ObamaObamas are 'most admired' man and woman in world: poll John Legend: Americans may have to think about leaving country if Trump reelected Black stars reimagine 'Friends' to get out the vote MORE, may still enter the 2020 presidential race — despite her numerous previous comments insisting she won’t run for president.

“Don’t bet against Michelle Obama,” Carlson said on his show Monday night. “Last week, the former first lady issued a statement saying that she has no interest in being president. That's what she claimed. But there are signs that that's not true."

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Carlson noted that Obama adviser David Axelrod David AxelrodThe Memo: Warning signs flash for Trump on debates GOP hunts for leverage in revived COVID-19 talks Pelosi says there shouldn't be any debates between Biden and Trump MORE’s attacks on Biden, as well as Barack Obama Barack Hussein ObamaDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE’s refusal to publicly endorse the top contender are two signs that his wife could enter the race.

"If Obama had endorsed Joe Biden, the race would be over,” Carlson said. “Obama hasn’t endorsed Joe Biden because he doesn't want to endorse Joe Biden. Why? Maybe he’s got other plans.”

Carlson added that it could also be a “coincidence” that the release of Michelle Obama’s newest book would “require her ... to get on the road and talk to crowds.”

“Obama's presidential memoir was also supposed to come out this year. Now, its release has been delayed until the middle of the Democratic primaries,” Carlson said. “In other words, at exactly the moment when Democrats will be thinking deeply about how to beat Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE, America will be talking about the Obamas.”

He added: “The Democratic Party is ripping itself apart over race and gender and class. Michelle Obama, let's be honest, is one of the only people who could unite the party's warring factions."

The former first lady has poured cold water on calls for her to launch a presidential bid, saying she believes there are other ways she can help the nation. She said in August there is “zero chance” that she will run for president.

Biden currently leads the crowded Democratic field in most polling, with a RealClearPolitics average of polls showing him with a more than 10-point lead over Sens. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.).