Democratic challenger concedes to Mississippi GOP Gov. Tate Reeves

Chris Christie, Republican presidential candidate, said Tuesday that any Republican who is "overconfident" about beating President Joe Biden in 2024 is "a foolish Republican," as Democrats celebrate victories and close races in some key statewide elections. 

Christie told CNN's Abby Phillip that Biden's incumbency is "a very strong tool," and noted the Democratic president "will always be a difficult opponent."

"He defeated an incumbent president himself just three years ago, so I don't think anybody should be overconfident," he said. "What we should be concerned about is if we're going to absolutely put a loser up against him."

A new CNN poll finds former President Donald Trump narrowly leads Biden, 49% to 45% among registered voters, in a hypothetical rematch.

The one-time Donald Trump ally called the former president "electoral poison," pointing to losses by Republicans in the past three elections and saying "tonight, you're seeing us lose again."

He said Kentucky Republican Daniel Cameron made a "huge mistake" by embracing Trump in the Kentucky gubernatorial race, and "the voters of Kentucky, very red state, as you noted, gave their verdict on politicians who sell their soul to Donald Trump."

Christie also reaffirmed his position that abortion restrictions should be decided at the state level, unless the country reaches a national consensus.

"If at some point there was a clear consensus amongst all 50 states about some number of weeks [for a ban], that would be something I'd be willing to consider, but it would have to be a consensus that was formed by the 50 states," he told Phillip.

Christie, who personally opposes abortion, said he'd consider signing a bill backed by the requisite 60 votes in the Senate, but noted he didn't "see that happening any time soon."

"Quite frankly, I want all the states to be able to make their own judgments on this before the federal government even considers weighing in," he said.

Ohio became the latest state on Tuesday to vote in favor of protecting abortion access after the Supreme Court overturned Roe vs. Wade last year.