Elizabeth Warren has weighed in on the Mueller report.

Sen. Elizabeth Warren said Friday that the House of Representatives should begin impeachment proceedings against President Trump in the wake of the release of the Mueller report.
"The Mueller report lays out facts showing that a hostile foreign government attacked our 2016 election to help Donald Trump and Donald Trump welcomed that help. Once elected, Donald Trump obstructed the investigation into that attack," she wrote in a series of tweets. 
"Mueller put the next step in the hands of Congress: 'Congress has authority to prohibit a President's corrupt use of his authority in order to protect the integrity of the administration of justice.' The correct process for exercising that authority is impeachment," she continued. "To ignore a President's repeated efforts to obstruct an investigation into his own disloyal behavior would inflict great and lasting damage on this country, and it would suggest that both the current and future Presidents would be free to abuse their power in similar ways."
"The severity of this misconduct demands that elected officials in both parties set aside political considerations and do their constitutional duty," Warren added. "That means the House should initiate impeachment proceedings against the President of the United States."
A number of Congressional Democrats, however, are taking a more cautious approach.   CNN reports that House Majority Leader Steny Hoyer said "impeachment is not worthwhile at this point."  Meanwhile, House Judiciary Committee Chairman Jerry Nadler noted that impeachment is "one possibility" Democrats can pursue to ensure Trump is held accountable.