Warren officially launched her presidential campaign on Saturday in her home state of MA at a mill site where largely immigrant and female factory workers went on strike in 1912 to call attention to the wealthy power brokers who "have been waging a class warfare against hardworking people for decades", Warren said in her speech.
There are also investigations underway into Trump's business and charity dealings, investigators working out whether he is unjustly profiting from his presidency, and whether he violated campaign finance laws.
Warren went on to describe Trump as "the symptom of a badly broken system".
Warren's weekend kickoff saw her formally joining a growing field of candidates for the Democratic Party's presidential nomination as the group competes for the opportunity to unseat Trump.
'Elizabeth Warren has already been exposed as a fraud by the Native Americans she impersonated and disrespected...'
The joke played on the hot water Warren found herself in for exaggerating her Native American ancestry over the years. "In fact, he may not even be a free person", she added.
In addition to the investigation by Robert Mueller, the special counsel, into Russian interference in the 2016 election, there are ongoing investigations spearheaded by federal prosecutors in NY and by the Democratic majority in the House of Representatives. "See you on the campaign TRAIL, Liz!" the President tweeted on Saturday.
Omar Apologizes For Tweet Some Called Anti-Semitic, Stands By AIPAC Criticism
She has supported the Boycott, Divestment, Sanctions ( BDS ) movement which aims to put economic and political pressure on Israel. Last month, Ms Omar apologised for saying Israel had "hypnotised" the world - a term once used by Nazis.
Warren has mostly stayed away from discussing the topic of a Trump impeachment.
The Massachusetts senator attended to introduce and honor her friend Cheryl Andrews-Maltais, chairwoman of the Wampanoag Tribe, the campaign said.
Warren told reporters her comments were a reference to the multiple investigations that have shadowed Trump's presidency.
Trump's tweet came shortly after Warrens formal declaration, where she urged a crowd in Lawrence, Massachusetts to back the "fight of our lives" against corruption and slanted regulations in Washington.
Haaland introduced Warren onstage, saying, "Indian Country needs strong allies like Elizabeth Warren, whose unwavering commitment to Native communities and Native American women and children is needed in this political era".
Warren's campaign launch has been shadowed by the controversy surrounding her past claims to Native American heritage.