If 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 testifies before the House Judiciary Committee, Chairman Jerry Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE should explain that the inquiries will not be limited to chargeable crimes but will draw on his unparalleled knowledge and expertise to assist Congress in its constitutional duty to exercise legislative oversight over the executive branch of government. The following are 21 questions that our lawmakers should ask Mueller.

Independent counsel Kenneth Starr found “substantial and credible information that President Clinton obstructed justice.” Leaving aside the question of a criminal charge, would you agree that your investigation uncovered substantial and credible information that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE obstructed justice? Your report concluded that “if we had confidence after a thorough investigation of the facts that the president had clearly not committed obstruction of justice, we would so state.” Does that mean you intended to leave the determination on obstruction to Congress?

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President Clinton was not criminally charged with obstruction of justice even after leaving office, but the House of Representatives still voted for articles of impeachment on obstruction and half the Senate voted to convict him. Would you agree that the standards for criminal violations are not the same as the standards for impeachment?

Can a person commit obstruction of justice by attempting to impede an investigation even if that attempt proved unsuccessful? Can a person commit obstruction of justice even if not charged with an underlying crime? Trump has disputed your findings that he asked White House counsel Don McGahn to fire the special counsel and then asked McGhan to lie about this instruction. How confident are you about your findings?

You found that the investigation “did not establish that members of the Trump campaign conspired or coordinated with the Russian government in its election interference activities.” Would you declare that conclusion indicates as some have argued that there was “no collusion” between Trump campaign officials and the Russian government or its operatives?

Would you agree that the June 2016 meeting at Trump Tower between campaign officials and Russians for the purpose of providing dirt on Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE constituted collusion, even if it fell short of a chargeable crime? Your report said that the cover up of this meeting began more than a year later and involved persons not in attendance. But is it not true that Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE himself began the cover up much earlier when he said in March 2017 that he did have any meetings with Russians that “were set up” or in which he had been “representing the campaign in any way”?

You found that Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE and his associate Rick Gates provided inside information to Konstantin Kilimnik, including polling data and targeting. What did the FBI say about the connection of Kilimnik to Russian intelligence? Would you agree that this information would have been of some value to the Russian interference operation?

Although you could not establish what happened with this information, would you agree that it is more likely than not that it was passed on to Russian intelligence or other operatives? Your charging document for the Internet Research Agency showed a close parallel between the Russian interference operation and the Trump campaign on matters such as issues, attacks on Hillary Clinton, and attempts to suppress the African American vote. Does this parallelism indicate that the information from Manafort could have been used by Russian government operatives?

Would the communications between Manafort and Kilimnik constitute collusion with Russians? You found that the Trump campaign welcomed and encouraged Russian assistance in the election, including the use of hacked and stolen emails. In your view, is it acceptable for a campaign to welcome and encourage such assistance from a hostile foreign power?

Before his victory, Trump criticized candidate Clinton for answering “I don’t recall” to questions during the email investigation. He also claimed to possess one of the best memories in the world. But he answered your written questions more than 30 times by saying “I don’t recall” or an equivalent. What inferences can you draw from these nonanswers?

The president and his backers have claimed that they fully cooperated with your investigation. Do you agree with that characterization? You documented numerous contacts between Russians and senior members of the Trump campaign, which they had failed to report to the FBI and typically covered up with lies. What big picture inferences can you draw from this pattern of behavior? Did anyone in the Justice Department or the administration in any way attempt to limit or influence your investigation?

You deferred a number of matters to other prosecutors. What can you tell us about these matters without jeopardizing ongoing investigations? Without disclosing sources and methods, did you uncover any evidence that Trump was compromised by Russians financially or in other ways?

Allan Lichtman is an election forecaster and distinguished professor of history at American University. Follow him on Twitter @AllanLichtman.