Vermont Sen. Bernie SandersBernard (Bernie) SandersSanders campaign reports raising M in less than a day The Memo: Bernie Sanders’s WH launch sharpens ‘socialist’ question Gillibrand uses Trump Jr. tweet to fundraise 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 BidenBiden slams Trump immigration policies: 'It’s about xenophobia' GOP pollster says Michelle Obama one of Democrats' best surrogates Meghan McCain: 'Don't underestimate' Bernie Sanders MORE was the front-runner in Harvard CAPS/Harris’s June poll with 32 percent.

Hillary ClintonHillary Diane Rodham ClintonSanders campaign reports raising M in less than a day The Memo: Bernie Sanders’s WH launch sharpens ‘socialist’ question Roger Stone invokes gag order in new fundraiser MORE, the party’s 2016 nominee, finished second with support from 18 percent, while Sanders was third with 16 percent.

Sen. Elizabeth WarrenElizabeth Ann WarrenSanders campaign reports raising M in less than a day The Memo: Bernie Sanders’s WH launch sharpens ‘socialist’ question Gillibrand uses Trump Jr. tweet to fundraise MORE (D-Mass.) had 10 percent.