AMES, IOWA — Speaking in Iowa on Sunday ahead of a possible 2020 presidential run, Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) thanked voters in the state for showing that his progressive policy ideas resonate with the public.

Sanders narrowly lost the 2016 Democratic Iowa caucuses to Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE, a result that he called a “tie” that fueled his campaign that year. Sanders ultimately lost the nomination to Clinton but received millions of votes.

“Why it was important in terms of what Iowa did in that very first caucus, is that it showed the American people that the ideas that we were talking about were not radical ideas or extremist ideas or ideas that were outside of the mainstream,” Sanders said at a rally at Iowa State University.

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“So it started off in Iowa and it went to New Hampshire and it went across the country. And ideas that just three years ago were perceived to be radical and extremist ideas are now ideas that are supported by the vast majority of the American people. Thank you Iowa,” he added.

Sanders spoke about several of his policy ideas that have gained traction in recent years, including a $15-per-hour minimum wage, tuition-free public college and "Medicare for all."

He said he understands that people may have voted for President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE in 2016 because they felt like they were being ignored by Washington but that Trump is a “pathological liar.”

“This president has no political beliefs,” Sanders said. “He is [an] opportunist of the worst kind.”

Sanders also criticized Trump for “using his bully pulpit to try to divide us up.”

“I say to President Trump that this country has struggled for too many decades, for too many centuries, in the fight against racism and sexism and homophobia and religious bigotry. We have fought too hard against people who are trying to divide us up,” Sanders said. “President Trump, we are not going backwards, we are going forward as one people.”

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Sanders campaigned at the event for J.D. Scholten, the Democratic nominee seeking to unseat GOP Rep. Steve King Steven (Steve) Arnold KingTrump, Biden deadlocked in Iowa: poll GOP leader: 'There is no place for QAnon in the Republican Party' Loomer win creates bigger problem for House GOP MORE in Iowa’s 4th Congressional District, and Deidre DeJear, the Democratic nominee for Iowa secretary of state.

Sanders, Scholten and DeJear all encouraged the attendees, many of whom were college students, to vote in the midterm elections and to get their friends and family members to do so as well.

“If we did nothing more than have people 30 years of age or younger vote in the same percentages as the general population, we can transform the United States of America,” Sanders said.

King criticized Sanders on Twitter earlier in the day.

Hey! @BernieSanders, Here is what Venezuelans (& Iowans) think of your Socialism. 1/2 pic.twitter.com/A5fyl5tQcN — Steve King (@SteveKingIA) October 21, 2018

And, @BernieSanders here is what those who survived both National Socialism & Soviet Socialism think of monuments to their suffering. 2/2 https://t.co/CwrFZBEMvQ — Steve King (@SteveKingIA) October 21, 2018

Scholten responded to King’s tweets, criticizing King for not debating him.

Look at @SteveKingIA trying to talk smack on Twitter but doesn’t have the guts to debate me... https://t.co/H6IZk9PXAR — J.D. Scholten (@Scholten4Iowa) October 21, 2018

Scholten faces an uphill battle in the race, which the nonpartisan Cook Political Report rates “likely Republican.”

But he said Democrats can win in rural areas by reaching out to people and proving that they will fight for them.

“We live in the land of ‘if you build it, they will come,’” he said. “If you build the right campaign and earn votes, get out there and earn votes, they will vote for you. If you build the right campaign that creates buzz, Sen. Bernie Sanders will come.”

Scholten was introduced at the event by Hill.TV anchor Krystal Ball, who has a PAC that endorsed the Democratic congressional candidate.

The rally in Ames came at the end of Sanders’s trip to Iowa to campaign for Scholten. Earlier on Sunday, he participated in a town hall with Scholten that was focused on Social Security and marched in Iowa State’s homecoming parade. He also held a rally with Scholten Saturday in Sioux City.

Sanders is in the middle of a nine-state tour ahead of the midterms. Prior to the stops in Iowa, he was in South Carolina, another state with an early nominating contest in 2020.

Sanders isn’t the only potential Democratic presidential candidate who has been spending time in Iowa in recent days. Colorado Gov. John Hickenlooper (D) was also in Iowa this weekend, and Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) will be in the state on Monday and Tuesday.

Scholten’s campaign said about 800 people attended the rally in Ames.

After the rally, Scholten said he’s grateful for Sanders’s help. The congressional candidate said he hasn’t had time to think about whether Sanders is going to run for president again, but added that “if he wanted to, I think it’s there for him.”