She also slammed Trump over his tweets, calling them "racist" and "hateful" and called for her supporters to ignore the President's comments and not to merely respond to every single action of Trump's.
She called President Donald Trump "the product of a rigged system that props up the rich and powerful and kicks dirt on everyone else".
Warren came under fire previous year for taking a DNA test to demonstrate her Native American ancestry. "Let him make a full report to the American people and then collectively we can make the decision about what the appropriate next step is".
"One of the things we're going to have to decide about how campaigns go forward is about what Donald Trump does every day", she told a crowd on in Iowa Tuesday.
"Here's how I see it: Donald Trump is not the only problem we've got", she reportedly said. Asked whether she believes Trump should be impeached, the Senator said it was important to first see Mueller's findings.
Ms Warren intends to spend Sunday in Iowa, where the lead-off caucuses will be the first test of candidates' viability.
Warren announced her campaign in her home state of MA at a mill site where factory workers went on strike in the early 20th century, a fitting forum for the longtime consumer advocate to advance her platform. "I've been grateful for her counsel as we've worked together to tackle issues of importance to Indian Country", Warren said in her introduction of Andrews-Maltais.
"Today Elizabeth Warren, sometimes referred to by me as Pocahontas, joined the race for President,"he tweeted, seemingly ignoring Native American groups' past calls to stop invoking the name of a historical Native American figure in a way to criticize a political opponent".
"The agenda is enormous and the fights will be tough", Warren said. It makes no matter to her that such investigations were based on lies paid for by Hillary Clinton.
Still, Warren must compete against other popular Democrats who will be able to raise substantial money.
Warren was introduced Tuesday by New Mexico Democratic Rep Deb Haaland, one of two Native Americans serving in Congress, who called the MA senator "a great friend to Indian Country". Still, about as many Democrats said they'd be at least somewhat likely to support Warren as said the same of Harris or Sanders.
"The chief and secretary of state appreciate that she has reaffirmed that she is not a Cherokee Nation citizen or a citizen of any tribal nation", tribe spokeswoman Julie Hubbard told the New York Times.
She will also need to win over female voters, which might explain the highly unusual - and somewhat risky - decision to include a story about potty-training her baby daughter.