Vermont Sen. Bernie SandersBernard (Bernie) SandersFive takeaways from Cruz, O'Rourke's fiery first debate Ben & Jerry’s co-founders announce effort to help 7 Dem House challengers Dems look to Gillum, Abrams for pathway to victory in tough states MORE  (I) during an interview late Tuesday refused to rule out running for the White House in 2020.

During an appearance on "The Late Show with Stephen Colbert," Sanders was asked if he was willing to put aside all speculation and announce that he would not be running in the coming election.

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“No,” Sanders abruptly answered to a roar of cheers and applause from the audience.

"But, what I have said time and time again,” Sanders, who ran in 2016, continued, “my focus right now is on 2018 and to do everything that I can to end one-party rule of the House and the Senate.”

“I’m working really, really hard on that,” Sanders said, while adding that it is still “too early to be talking about 2020.” 

“Well, please come back when its not too early,” Colbert said.

Sanders finished third among possible 2020 candidates in a poll of registered Democratic voters earlier this summer.

Vice President Joe BidenJoseph (Joe) Robinette BidenDems with political experience could have edge in 2020 primary, says pollster Ford taps Obama, Clinton alum to navigate Senate hearing Trump endorses Republican candidate in key NJ House race MORE was the front-runner in Harvard CAPS/Harris’s June poll with 32 percent.

Hillary ClintonHillary Diane Rodham ClintonFive takeaways from Cruz, O'Rourke's fiery first debate Heller embraces Trump in risky attempt to survive in November Live coverage: Cruz, O'Rourke clash in Texas debate MORE, the party’s 2016 nominee, finished second with support from 18 percent, while Sanders was third with 16 percent.

Sen. Elizabeth WarrenElizabeth Ann WarrenMore Massachusetts Voters Prefer Deval Patrick for President than Elizabeth Warren Trump's trade war — firing all cannons or closing the portholes? Poll: Most Massachusetts voters don't think Warren should run for president in 2020 MORE (D-Mass.) had 10 percent.