Trump: 'Witch Hunt ... must never be allowed to happen again!'

President TrumpDonald John TrumpPapadopoulos on AG's new powers: 'Trump is now on the offense' Pelosi uses Trump to her advantage Mike Pence delivers West Point commencement address MORE focused early on Sunday on special counsel Robert MuellerRobert (Bob) Swan MuellerThe Hill's 12:30 Report: Trump orders more troops to Mideast amid Iran tensions Trump: Democrats just want Mueller to testify for a 'do-over' Graham: Mueller investigation a 'political rectal exam' MORE's investigation into Russia's interference, calling it a "witch hunt" and saying it "must never be allowed to happen again." 

"Think of it," Trump tweeted amid a battle over Mueller's report. "I became President of the United States in one of the most hard fought and consequential elections in the history of our great nation."

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"From long before I ever took office, I was under a sick & unlawful investigation concerning what has become known as the Russian Hoax," he continued in a separate tweet. "This never happened before in American history, and it all turned out to be a total scam, a Witch Hunt, that yielded No Collusion, No Obstruction."

"This must never be allowed to happen again!" he added

The comments from Trump come weeks after Mueller's report on his investigation into Russia's interference and whether the president committed obstruction of justice was released in a redacted form. 

Mueller's investigation did not uncover evidence to conclude that a conspiracy took place between Trump's 2016 campaign and Moscow. However, the report noted that Mueller could not make a conclusive determination in regard to whether Trump obstructed justice. 

Democratic lawmakers have vowed to further investigate Trump on matters related to collusion, among other things. But the Trump administration has been resistant to these efforts. 

Attorney General William BarrWilliam Pelham BarrPapadopoulos on AG's new powers: 'Trump is now on the offense' House Democrats must insist that Robert Mueller testifies publicly Why Mueller may be fighting a public hearing on Capitol Hill MORE last week failed to comply with a congressional subpoena for Mueller's full, unredacted report and underlying documents. The House Judiciary Committee, chaired by Rep. Jerrold NadlerJerrold (Jerry) Lewis NadlerDemocrats are running out of stunts to pull from impeachment playbook Trump asks if Nadler will look into Clinton's 'deleted and acid washed' emails Trump tweets conservative commentator's criticism of FBI director MORE (D-N.Y.), responded by voting to hold Barr in contempt.