Mike Bloomberg's campaign said on Tuesday that it sees Sen. Bernie Sanders, I-Vt., as the only threat to Bloomberg winning the Democratic nomination and defeating Donald Trump in 2020.

Dan Kanninen, the lead state strategist for Bloomberg's campaign, led off a briefing with reporters by saying Bloomberg and his team view Sanders as the only other candidate who has a shot at being "sworn into office next year."

When asked why former Vice President Joe Biden was not on his list of candidates who could beat Trump in November, Kanninen pointed to a new round of polling, including in Florida, that he described as showing former front-runner Biden's status had "collapsed."

"It's consistent [with] what we are seeing from our own numbers. It's consistent [with] what we are seeing on the ground," the Bloomberg advisor said about Biden's struggles, while noting the growing crowd size at rallies for the former New York mayor in Florida, Virginia, Arkansas and Oklahoma.

Biden has dropped in recent surveys since his disappointing fourth-place finish in the Iowa caucuses, while Sanders and Bloomberg have surged. A Real Clear Politics polling average has Sanders in first, followed by Biden and Bloomberg, who started the race in seventh.