congress. professor gerhardt, i'd like to now ask you some questions about a third impeachable offense, and that is obstruction of justice. sir, have you formed an opinion as to whether president trump committed the impeachable offense of on instructibstructi justice? >> yes, i have. >> what is your opinion, sir? >> i've come here like every other witness assuming the facts that have been put together in official reports. the mueller report cites a number of facts that indicate the president of the united states obstructed justice. that's an impeachable offense. >> in your testimony, sir, you pointed out that the mueller report found at least five instances of the president's obstruction of the justice department's criminal investigation into russian interference in the 2016 election, correct? >> yes, sir. >> and the first of those instances was the president's