fiercely progressive and she and Clinton have been frosty in the past but she is now being vetted as a potential running mate

, Ohio, in first campaign rally as a pair

Elizabeth Warren gave Donald Trump a taste of what he can expect on the campaign trail if Hillary Clinton picks her to be her vice president - a daily tongue lashing that rivals his own scorched-earth tactics against his opponents.

Introducing Clinton, Warren ripped into the Republican billionaire today at a rally in Cincinnati, Ohio - her first time on stage with the Democrat.

'When Donald Trump says he'll make America great, he means make it even greater for rich guys just like Donald Trump,' Warren charged. 'That's who Donald Trump is - the guy who wants it all for himself.'

Trump is a 'small, insecure money grubber,' she said, reviving a recent attack on real estate mogul. And he looks 'goofy' in his Make America Great hat, Warren said, mocking him with the same word he used to ridicule her.

'Watch out, he will crush you into the dirt to get whatever he wants,' the progressive senator warned.

SCROLL DOWN FOR VIDEO

Elizabeth Warren gave Donald Trump a taste of what he can expect on the campaign trail if Hillary Clinton picks her to be her vice president - a daily tongue lashing that rivals his own scorched-earth tactics against his opponents

'When Donald Trump says he'll make America great, he means make it even greater for rich guys just like Donald Trump,' Warren charged. 'That's who Donald Trump is - the guy who wants it all for himself'

Introducing Clinton, Warren ripped into the Republican billionaire today at a rally in Cincinnati, Ohio - her first time on stage with the Democrat

Still in her first-term, Warren has built up a loyal following in the left flank of the Democratic Party.

She was the preferred candidate of progressives in the presidential election but took a pass on the Oval.

Bernie Sanders ran instead. And while he lost to Clinton in the end, the independent energized a faction of the party that's hungry to see it take on America's richest 1 percent.

They say Clinton is too centric, and they won't vote for her in November unless she absorbs at least some of the policies that Sanders ran - especially a more aggressive approach to regulating Wall Street.

Warren cut her teeth in politics on making the wealthy pay their fair share and would help Clinton with that crowd.

She's reportedly on the campaign's shortlist to serve as vice president, though it won't formally confirm the Massachusetts lawmaker is being vetted.

On Monday in Cincinnati the campaign took the duo out for a test drive, with Clinton and Warren delivering a companion speeches that weaved their background and childhoods into a singular vision of a new American Dream.

'You just saw why she is considered so formidable, because she tells it like it is,' Clinton said when Warren had finished.

Warren is reportedly on the campaign's shortlist to serve as vice president, though it won't formally confirm she is being vetted

On Monday in Cincinnati the campaign took the duo out for a test drive, with Clinton and Warren delivering a companion speeches that weaved their background and childhoods into a singular vision of a new American Dream

GIRL POWER: If Clinton picks Warren, the nation could have its first woman president AND vice president

Pre-empting Warren's speech, Trump reprised his assault on Warren over her past claims that she's Native American.

'Crooked Hillary is wheeling out one of the least productive senators in the U.S. Senate, goofy Elizabeth Warren, who lied on heritage.'

Warren retorted at the rally, 'Donald Trump says he will make America great again. It is right there... it's stamped on the front of his goofy hat.

'You want to see goofy? Look at him in that hat,' she said.

When Trump says he'll Make America Great Again 'great for who exactly?' she pressed.

'For families that don't fly to Scotland to play golf?'

Clinton later remarked, 'I do just love to see how she gets under Donald Trump's skin.'

His campaign said in a statement after their joint appearance on Monday morning that Warren' has become a turncoat for the causes she supposedly supports.

'Warren claims that Wall Street businesses have too much influence in D.C., by paying “barely disguised bribes,” through campaign contributions. The Clinton campaign has accepted over $41 million this cycle from Wall Street interests,' it said.

She also states she is against the Trans-Pacific Partnership, which Clinton helped to author, as a member of Obama's cabinet.

'Warren’s campaigning for Clinton stands in stark contrast to the liberal ideals she once practiced,' Trump's campaign said, lambasting Warren and Clinton for the 'sad attempt at pandering to the Sanders wing.'

Trump meanwhile went off on Warren over her 'heritage' in an NBC in interview where he called made fun of her and called her 'Pocahontas.'

Supporters stand outside the Cincinnati Museum unable to get in to today's rally in Cincinnati. The Line was more than a block long when the campaign closed the doors

At Monday's event Warren showed Trump her teeth, telling a packed crowd at Cincinnati's former train station that Trump cheered Britain's 'current crisis' - it's exit from the European Union - because 'it might bring more rich people' to his Scottish golf course.

'He cheered on students desperate enough to sign up for his fake university so he can bleed them dry and turn a profit for himself,' she said.

Warren asked, rhetorically, 'What kind of a man does that? What kind of a man roots for people to lose their jobs, to lose their homes, to lose their life's savings?

'I'll tell you what kind of a man - a small, insecure money grubber who fights for no one but himself,' she charged. 'What kind of a man? A nasty man who will never become president of the United States.'

As she closed Warren hinted at a future role in Clinton's campaign and said, 'You know I could do this all day.'

Clinton said she was 'thrilled' to have Warren at her side today 'because we want to make the point together that we must have an economy that works for everyone again, not just those at the top. Not just the rich or the well-connected. Everybody.'

And she again hit Trump for allowing his signature products to be made in other countries.

'Trump's suits were made in Mexico. He could've had them made in Brooklyn, Ohio. Trump Furniture is made in Turkey, instead of Cleveland. Trump Barware is made in Slovenia, instead of Toledo,' she said, naming large Ohio cities.

Clinton added, 'How does that all fit into his talk about America first?'

And that's just the start, she said.

'This is a man who plays coy with white supremacists and mocks people with disabilities, who talks about banning an entire religion from entering our country, who advocates getting rid of gun free zones in schools, letting more countries have nuclear weapons, defaulting on our national debt, turning back the clock on marriage equality...

'And just like Elizabeth, I could go on and on,' Clinton said.

Wrapping up her rant, Clinton said, 'This is someone whose reaction to the horrific mass shooting in Orlando was to publicly congratulate himself.

'When Britain voted to leave the European Union, he crowed from his golf course about how the disruption could end up creating higher profits for that golf course, even though, within 24 hours, Americans lost $100 billion from our 401(k)s. He tried to turn a global economics challenge into a infomercial.

Clinton said, 'Imagine Donald Trump sitting in the Oval Office the next time America faces a crisis.'

Prior to her 2012 election to the U.S. Senate, Warren helped found the Consumer Financial Protection Bureau.

She couldn't have been nominated to lead it - Republicans in the Senate would have revolted - and so she was passed over. She then ran against incumbent Scott Brown for his seat in the U.S. Senate and won despite the scandal over her Native American heritage that had Republicans calling her 'Fauxcahonas.'

In 2014 she wrote a letter along with 12 other Democratic women in the U.S. Senate encouraging Clinton to run. She did not endorse her until the end of primary, however.

Warren sat on the sidelines while Sanders took Clinton on and did not give the former secretary of state her support until she was the clear winner.

Her willingness to campaign for the ex-New York senator has Republicans calling her a 'sellout' given her history with Clinton.

She blasted Clinton in her 2003 for flip-flopping on a bankruptcy bill and said the former first lady was being influenced by campaign donors in the banking business.

On a call hosted by the Republican National Committee Monday afternoon Brown said it was 'uncomfortable' to watch Warren embracing Clinton on stage today.

Clinton took millions from Wall Street for paid speeches she still won't make public, he pointed out.

'I'm not sure how she can justify it, supporting the queen of Wall Street,' the ousted U.S. senator said.

Between the two of them they have quite a few 'credibility' issues, he said, mentioning Warren's 'heritage.'

'As we all know she's not Native American,' he said. 'She has no Native American background except for what her family told her.'