Sen. Bernie Sanders' crowd chanted 'lock him up' about President Trump Sunday night in Minnesota, at the raucous rally where Congresswoman Ilhan Omar made her endorsement of the Vermont senator official.

Omar pitched that a 'mass movement of the working class' was needed to oust Trump and end 'Western imperialism.'

She also explained why she decided to back Sanders and not the politically similar Sen. Elizabeth Warren, saying both she and Sanders were D.C. survivors and had an immigrant story.

'For a long time Bernie was underestimated, his ideals weren't taken seriously by the establishment because he refused to fall in line,' she told a roaring crowd at the University of Minnesota, situated close to her Congressional district. 'And noone knows what he's been through then someone like me, surviving in Washington.'

Sanders recently survived a heart attack - which put his presidential campaign on pause - while Omar has had to weather attacks from President Trump and his supporters, and pull through a sex scandal.

Sen. Bernie Sanders' crowd chanted 'lock him up!' about President Trump during a racous rally in Minneapolis Sunday night, as he officially gained Rep. Ilhan Omar's endorsement

Sen. Bernie Sanders (left) and Rep. Ilhan Omar (right) stand together onstage at the University of Minnesota Sunday night. Omar endorsed Sanders in mid-October and made it official at the joint event

Sen. Bernie Sanders (center) comes onstage to greet Rep. Ilhan Omar (right), who appeared at a Minneapolis rally with him Sunday night. Sanders' wife Jane (left) takes in the crowd

Rep. Ilhan Omar explained to a crowd at the University of Minnesota why she decided to back Sen. Bernie Sanders

More than 10,000 came to hear Sen. Bernie Sanders, and Rep. Ilhan Omar, speak Sunday night at the Williams Arena at the University of Minnesota

FEELING THE BERN: Rep. Ilhan Omar made her mid-October endorsement of Sen. Bernie Sanders official, speaking at a rally in her hometown of Minneapolis Sunday night

Rep. Ilhan Omar made her endorsement of Sen. Bernie Sanders official explaining that he was her choice because they've both had to survive Washington

Ilhan Omar (right) and Sen. Bernie Sanders (left) both went after President Trump, with the University of Minnesota crowd chanting 'lock him up!' and also Sanders' 2020 slogan 'not me. us'

Sen. Bernie Sanders appeared in Minneapolis, Minnesota Sunday night as part of a comeback tour post heart-attack

Sen. Bernie Sanders (right) came onstage in Minneapolis, Minnesota with wife Jane Sanders (left) as supporters waved blue and white Bernie signs

A crowd of 10,140 greeted Sen. Bernie Sanders at the University of Minnesota Sunday night, as he welcomed Rep. Ilhan Omar to his team of progressive supporters

Sen. Bernie Sanders delivered his grand vision of a Green New Deal and free college for all at the basketball stadium at the University of Minnesota

Some of Sen. Bernie Sanders' supporters yelled 'lock him up!' in reference to President Trump, while others happily cheered 'not me, us,' the senator's 2020 slogan

Sen. Bernie Sanders (right) and Rep. Ilhan Omar (lower left) greet supporters during Sunday night's rally in Minnesota

The firebrand freshman referenced Trump's top attack on her - a suggestion that she should go back to Somalia, where she was born, as she contrasted Sanders - a self-proclaimed democratic socialist - with the Republican president.

'And just as a matter of fact, nobody is going back,' she told the crowd, as some said Trump should be locked up.

She also connected her refugee past with Sanders' as she explained to the crowd why she supported the 78-year-old senator from Vermont.

'I am proud to stand by the son of a Jewish refugee who survived genocide,' Omar said.

Sanders did the same, remarking that while some people see he and Omar as an 'odd political couple,' that's not the case, referencing that shared immigrant experience.

Sanders thanked the crowd for 'having Ilhan's back,' when Trump was making her a target.

'Ilhan has stood up to Trump and we will stand with her,' Sanders said.

Sanders asked the crowd to join him if they were 'sick and tired of the racism and the Jim Crow-ism and the bigotry' coming from the current White House.

The crowd of 10,140, according to a university spokesman, ate it up - at one point shouting a 'lock him up' chant, similar to what Washington Nationals fans chanted last Sunday at Trump.

Rep. Ilhan Omar got huge cheers from the crowd as she explained to Sen. Bernie Sanders' supporters why she's decided to support him for president

At other points in the rally they used the friendlier, 'Not Me. Us,' which is Sanders' 2020 slogan. They also gave shout-outs to the 'Green New Deal!'

'This is a president who deserves to be impeached and will be,' Sanders pledged.

When Sanders came onstage with his wife Jane, he touted his endorsements from Omar, as well as Reps. Alexandria Ocasio-Cortez and Rashida Tlaib, three-fourths of the so-called 'Squad.'

The only holdout is Rep. Ayanna Pressley, a Democratic freshman from Massachusetts.



Sanders suffered a heart attack on Oct 1., keeping him off the campaign trail until the Oct. 15 Democratic debate in Westerville, Ohio.

During the debate the news broke that Omar was endorsing Sanders - giving him a much needed enthusiasm bump. That was coupled with Ocasio-Cortez saying she also planned to endorse Sanders, making it official at a weekend New York City rally billed as part of his comeback tour.

On Sunday, he peppered his speech with his normal Trump insults - that he's racist and corrupt.

While pitching policies like free college to the mostly young audience.

Three new polls that were released in the hours before the rally all showed Sanders in third, behind former Vice President Joe Biden and Sen. Elizabeth Warren, who represents the same, more liberal wing of the Democratic Party.

A Fox News poll shows that support for Sanders has dropped a few points since March, but he'd still soundly beat Trump.

Among registered voters polled, Sanders gets 49 percent support to Trump's 41 percent. The only Democrat to do better than Sanders is Biden, beating Trump by 12 points.

On Sunday night, Minneapolis-based rapper Brother Ali kicked off the rally with a politically-tinged set, with lyrics accusing President Trump of rape and condemning the government's treatment of black people.

Keith Ellison, the attorney general of Minnesota and a former Democratic member of Congress, was part of Sen. Bernie Sanders' and Rep. Ilhan Omar's warm-up act

The late Prince's band the New Power Generation opened for Sen. Bernie Sanders and Rep. Ilhan Omar on Sunday night

Minnesota-based rapper Brother Ali kicked things off at Sunday night's Bernie Sanders rally, complete with lyrics that called President Trump a 'rapist' and condemned the U.S. government's treatment of black people

Rep. Ilhan Omar made her October 15 endorsement of Sen. Bernie Sanders official as they appeared together at a rally Sunday night on the University of Minnesota's campus

Sen. Bernie Sanders was off the campaign trail for two weeks in October as he recovered from a heart attack. Now he's doing a 'Bernie's Back' tour with some of the liberal 'Squad' members like Rep. Ilhan Omar

The late Prince's band the New Power Generation played next, performing a set that included Prince and a Bob Marley cover, as a crowd of mostly young supporters nearly filled the entirety of the main level of Williams Arena, a basketball stadium, which holds around 14,000 people.

'Trump is a demagogue who wants to divide us with hate. When we stand together, we will defeat him in a landslide,' Sanders tweeted during New Power Generation's performance.

A year out from the presidential election, Omar marked 10 months in Congress on Sunday too.

In just under a year, Omar has turned into one of Trump's favorite targets.

She's had her Democratic colleagues rally around her - especially after Trump's crowd cried out 'send her back!' - even after she was accused by some in her own party of voicing anti-Semitic stereotypes. Omar, a Somali-born American citizen, is one of just two Muslim women to have ever served in Congress.

And she's been at the center of a sex scandal, with the wife of her alleged boyfriend Tim Mynett, filing divorce papers in D.C. court in August, claiming that they were carrying on an affair.

The congresswoman filed for divorce from her husband last month.