Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) slammed Congress as “complicit” in the latest scandal surrounding President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE’s conversations with the Ukrainian president by “failing to act” after special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's report.

“After the Mueller report, Congress had a duty to begin impeachment. By failing to act, Congress is complicit in Trump’s latest attempt to solicit foreign interference to aid him in US elections,” Warren tweeted. “Do your constitutional duty and impeach the president.”

A president is sitting in the Oval Office, right now, who continues to commit crimes. He continues because he knows his Justice Department won't act and believes Congress won’t either. Today’s news confirmed he thinks he’s above the law. If we do nothing, he’ll be right. — Elizabeth Warren (@ewarren) September 20, 2019

The tweet came after reports that emerged Friday revealing that Trump asked the president of Ukraine during a July phone call to investigate the son of Democratic presidential candidate and former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE.

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“A president is sitting in the Oval Office, right now, who continues to commit crimes. He continues because he knows his Justice Department won't act and believes Congress won’t either. Today’s news confirmed he thinks he’s above the law. If we do nothing, he’ll be right,” said Warren.

Trump has called for an investigation into Biden’s ties to Ukraine during his time as vice president. Republicans have criticized his 2016 efforts to have the Ukrainian president dismiss a prosecutor who was investigating a natural gas company owned by a Ukrainian oligarch, whose board members included his son, Hunter. No evidence has emerged to suggest Biden acted to protect his son.

But it is Trump’s connection to Ukraine that have been under harsh scrutiny in recent days over a whistleblower complaint from someone in the intelligence community that reportedly details a troubling "promise" the president made to a foreign leader. It was later reported that the whistleblower’s claims specifically centered around Ukraine.

Warren, who is running for president, emerged as an early advocate of impeachment, saying former special counsel Robert Mueller laid out sufficient evidence of obstruction of justice in his final report.