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 on Monday questioned why 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 and his team did not speak with “the people who were closest” to him and his campaign, even though Mueller interviewed several former aides and the president did not agree to sit with the special counsel.

“Isn’t it amazing that the people who were closest to me, by far, and knew the Campaign better than anyone, were never even called to testify before Mueller,” Trump tweeted. “The reason is that the 18 Angry Democrats knew they would all say ‘NO COLLUSION’ and only very good things!”

Isn’t it amazing that the people who were closest to me, by far, and knew the Campaign better than anyone, were never even called to testify before Mueller. The reason is that the 18 Angry Democrats knew they would all say ‘NO COLLUSION’ and only very good things! — Donald J. Trump (@realDonaldTrump) April 22, 2019

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The special counsel spoke to several White House staffers, including a number of people who worked on the 2016 campaign, as part of his nearly two-year investigation into Russian interference in the 2016 election. A redacted version of Mueller's final report was released last week.

In it, the special counsel said the probe did not establish that Trump colluded with the Russian government. Mueller neither exonerated nor implicated Trump on obstruction of justice but detailed 10 "episodes" that investigators reviewed for the charge.

Among those who cooperated with the special counsel, according to the report, were White House senior adviser Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, White House press secretary Sarah Huckabee Sanders, former Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE and former White House counsel Don McGahn, all of whom worked on the campaign in some capacity. Campaign aides Hope Hicks Hope Charlotte HicksSenate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Cuomo turned down Trump invitation to participate in April press briefing: report Trump shakes up White House communications team MORE, Corey Lewandowski Corey R. LewandowskiHow Trump can win reelection: Focus on Democrats, not himself Trump Jr. distances from Bannon group, says he attended 'single' event Bannon, three others charged with defrauding donors of 'We Build The Wall' campaign MORE and Stephen Bannon also cooperated.

Tweets from the president since the report’s release suggest he is not happy with the news coverage, some of it fueled by notes taken by McGahn and others who provided their paperwork to Mueller’s team.

Trump pushed back earlier Monday against the idea that his aides routinely went against his directives, as laid out in multiple instances in the Mueller report, telling reporters that "nobody disobeys my orders."

Trump added that he was “not even a little bit” worried about the specter of impeachment.

Trump did not sit for an in-person interview with Mueller and instead provided written answers to the special counsel's questions.

The president wrote on more than 30 occasions that he did not recall, remember or have independent memories of key events throughout the Russia investigation, leading Mueller's team to deem his written responses to questions “inadequate.”

Mueller said he considered issuing a subpoena for Trump to sit for an interview but ultimately decided against it because it would have resulted in a drawn-out legal fight.

Trump and his allies declared victory in the wake of Mueller's report becoming public, claiming that it cleared the president of wrongdoing. However, the president has remained fixated on the special counsel in recent days, attacking his team's credibility and jabbing at the former aides who provided notes to investigators.