Vermont Sen. Bernie SandersBernie SandersThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Warren, Buttigieg duke it out in sprint to 2020 The Memo: Pelosi-Trump trade deal provokes debate on left 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 BidenJoe BidenThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Democrats seek leverage for trial Democrats spend big to put Senate in play MORE was the front-runner in Harvard CAPS/Harris’s June poll with 32 percent.

Hillary ClintonHillary Diane Rodham ClintonDemocrats seek leverage for trial Davis: Trump vs. Clinton impeachments – the major differences Sharice Davids to vote for Trump impeachment articles: 'The facts are uncontested' MORE, the party’s 2016 nominee, finished second with support from 18 percent, while Sanders was third with 16 percent.

Sen. Elizabeth WarrenElizabeth Ann WarrenThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Warren, Buttigieg duke it out in sprint to 2020 The Memo: Pelosi-Trump trade deal provokes debate on left MORE (D-Mass.) had 10 percent.