Rep. Adam Schiff said that the Trump administration's "failure to produce this witness" could be considered "strong evidence of obstruction."
Lewandowski again acknowledged that he never read the Mueller report but said he understood its conclusions.
"Mueller gives us a slice of bread, puts ham on it, and then another slice of bread," Lieu tweeted. "Mueller says I didn't make a determination whether or not it's a ham sandwich because I was instructed I can't call it that."
Chris Truax, a Republicans for the Rule of Law legal adviser and spokesperson, said the ad, which encourages GOP members to take Trump's obstruction allegations "seriously," serves as "a reminder of what patriotism and political bravery can look like."
"Attorney General Barr has deliberately misrepresented key aspects of Mueller's report and decisions in the investigation, which has helped further the president's false narrative," Representative Justin Amash wrote on Twitter.
Barr has "a very narrow, almost Jesuitical, understanding of the law" former judge Andrew Napolitano explained.
Preet Bharara, a former U.S. attorney in New York, said the Mueller report preserves evidence for when President Donald Trump loses his immunity after leaving office.
Special counsel Robert Mueller "expressed frustration over the lack of context and the resulting media coverage regarding the special counsel's obstruction analysis," a Justice Department spokesperson said.
House Oversight Committee Chairman Elijah Cummings said Bill Clinton's behavior "pales in comparison" to Donald Trump's alleged efforts to obstruct justice.
"Mueller believed a fairness principle constrained him from accusing the president in the form of recommended charges," a former FBI counterintelligence agent wrote.
Donald Trump intended to fire Robert Mueller, according to the special counsel's report.
"The conclusion that Congress may apply the obstruction laws to the President's corrupt exercise of the powers of office accords with our constitutional system of checks and balances and the principle that no person is above the law," special counsel Robert Mueller wrote.
Attorney General William Barr told lawmakers that evidence relating to whether the president obstructed justice "will be identifiable" when he releases a redacted version of the Mueller report next week.
In addition, a former senior counsel to independent counsel Ken Starr's Whitewater probe of President Bill Clinton tweeted that the actions would constitute "impeachable activity."
"All of them, I consider, are material witnesses to a federal crime," Anibal Romero said of undocumented workers who were fired from Trump golf clubs.
"It goes something like this, 'If you don't go easy on Flynn, I'll break your kneecaps," the lawyer and former New York City mayor said.
Republicans have been largely silent about the allegations, with some calling the report false or either showing reluctance to answer questions on the matter.
A report from BuzzFeed News that Trump instructed Michael Cohen to lie to Congress under oath could have major ramifications.
"He's going to have to bring his toothbrush to court on Friday," a former U.S. attorney said Tuesday.
Critics say President Donald Trump's legal team's stance that he cannot obstruct justice is position a king or dictator would take.
President Trump's lawyers expressed concern that he could be exposed to accusations by investigators of lying, or committing a crime, or an impeachable offense.
"I liken it to being on a wild horse," Steyer said of America under Trump.