Sanders: 2020 campaign will spark 'unprecedented' grass-roots movement

Sen. Bernie SandersBernie SandersIraq War looms over Trump battle with Iran 2020 Dems break political taboos by endorsing litmus tests Iowa Democrats brace for caucus turnout surge MORE (I-Vt.) on Tuesday said that his newly announced 2020 campaign for president would launch an "unprecedented" grass-roots movement that will help transform the U.S. economy and politics in the nation.

In an interview with "CBS This Morning," Sanders said that the biggest difference between his 2020 campaign and an unsuccessful for the Democratic nomination in 2016 was that "we're gonna win."

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"We're gonna win. We are gonna also launch what I think is unprecedented in modern American history and that is a grass-roots movement ... that will lay the groundwork for transforming the economic and political life of this country," Sanders said.

Sanders called defeating President TrumpDonald John TrumpTrump rips Dems' demands, impeachment talk: 'Witch Hunt continues!' Nevada Senate passes bill that would give Electoral College votes to winner of national popular vote The Hill's Morning Report - Pelosi remains firm despite new impeachment push MORE in 2020 the most important goal for Democrats.

“It is absolutely imperative that Donald Trump be defeated, because I think it is unacceptable and un-American, to be frank with you, that we have a president who is a pathological liar ... it gives me no pleasure to say that, but it's true," Sanders said.

Questioned by John Dickerson whether his values would be more in line with the Democratic base in 2020, Sanders noted that much of his 2016 presidential platform has become mainstream in the Democratic Party.

"I think a lot of people would say that," Sanders said.

Sanders also took shots at former Starbucks CEO Howard Schultz, accusing the possible 2020 candidate of trying to "blackmail" the Democratic Party by threatening to run as an independent if the party does not select a centrist as its nominee.

“There are a lot of people I know personally who work hard for a living, who make $40,000, $50,000 a year who know a lot more about politics than, in all due respect, does [Howard] Schultz," Sanders said.

"I think his deeper theory is, 'Hey, I'm a billionaire. Leave me alone. And let me make as much as money as I can without paying my fair share of taxes,' " the senator added.

Sanders placed second in the 2016 Democratic contest, and supported Hillary ClintonHillary Diane Rodham ClintonNevada Senate passes bill that would give Electoral College votes to winner of national popular vote 2020 Dems break political taboos by endorsing litmus tests Iowa Democrats brace for caucus turnout surge MORE in the general election after endorsing her presidential campaign at the Democratic convention. If elected, he would be America's first Jewish president as well as the oldest person ever elected to a first term in the White House.