The top Democrat on the US House Judiciary Committee says he believes there is "substantial evidence" that President Donald Trump committed high crimes and misdemeanours.
He plans to ask former special counsel Robert Mueller to present those facts at a congressional hearing on Wednesday.
"The report presents very substantial evidence that the president is guilty of high crime and misdemeanours, and we have to let Mueller present those facts to the American people and then see where we go from there," committee chairman Jerrold Nadler said on Fox News Sunday.
US President Donald Trump this week. Source: AAP
"The administration must be held accountable, and no president can be above the law."
Mr Nadler's comments are significant because evidence of such crimes would be required if Democrats pursue impeachment proceedings against the president.
Mr Mueller completed his nearly two-year-long probe into Russian meddling in the 2016 election in March, and the Justice Department released a redacted copy of his report in April.
In two nationally televised back-to-back hearings on Wednesday before the House Judiciary and Intelligence committees, Democrats are expected to try and get Mr Mueller to focus his testimony on specific examples of Mr Trump's misconduct.
By having Mr Mueller lay bare the unflattering details of how Mr Trump tried to stymie the investigation into his campaign, Democrats hope they can build support for their ongoing investigations into the president and potentially, impeachment proceedings.
Some Democrats in congress support impeaching Mr Trump but they have not managed to win traction with House Democratic leadership including Speaker Nancy Pelosi, who has preferred a more cautious approach that entails conducting congressional fact-finding investigations into Mr Trump's conduct.
Last week, the House voted 332-95 to table an impeachment resolution.
The Mueller report laid out numerous contacts between Russian officials and Mr Trump's campaign but found no evidence of a criminal conspiracy.
It also gave examples of 10 incidents in which Mr Trump sought to hinder the investigation, but it did not draw any conclusions on whether Mr Trump obstructed justice.
Attorney General William Barr later concluded he did not see enough evidence to bring obstruction charges.
Whether Democrats will get Mr Mueller to discuss Mr Trump's conduct in detail remains to be seen.
Mr Mueller has made it clear he has no desire to appear before Congress, saying the report is his testimony, and he is also notorious for being tight-lipped and for giving one-word answers in hearings.
Adam Schiff, the chairman of the House Intelligence Committee, said on CBS' Face the Nation that part of the goal of the hearings is to ensure the American people who have not read the report can hear its findings.
"Most Americans in their busy lives haven't had the opportunity to read that report, and it is a pretty dry, prosecutorial work product. We want Bob Mueller to bring it to life ... It's a pretty damning set of facts," he said.
Mr Nadler said on Fox that Democrats plan to ask very specific questions about Trump's obstructive conduct and ask Mueller to read passages from the report aloud.
"We hope it won't end up being a dud," he said of the hearing.
Mr Nadler also said on Sunday he planned to go to court "within a couple of days" after the Mueller hearings to enforce a subpoena after the White House ordered former counsel Don McGahn not to testify about incidents he witnessed which many say show Mr Trump tried to obstruct justice.
