President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE said in an early morning tweet on Tuesday that he should focus his attention on his responsibilities in the White House, as opposed to the investigation into possible collusion between his campaign and Russia.

He also suggested once again that the investigation should focus on his former Democratic challenger, Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE, and a cadre of former Obama administration officials.

"Sorry, I’ve got to start focusing my energy on North Korea Nuclear, bad Trade Deals, VA Choice, the Economy, rebuilding the Military, and so much more, and not on the Rigged Russia Witch Hunt that should be investigating Clinton/Russia/FBI/Justice/Obama/Comey/Lynch etc.," Trump said.

Sorry, I’ve got to start focusing my energy on North Korea Nuclear, bad Trade Deals, VA Choice, the Economy, rebuilding the Military, and so much more, and not on the Rigged Russia Witch Hunt that should be investigating Clinton/Russia/FBI/Justice/Obama/Comey/Lynch etc. — Donald J. Trump (@realDonaldTrump) May 29, 2018

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The tweet was his fourth in less than an hour decrying the law enforcement investigation into Russian efforts to meddle in the 2016 election and whether members of his campaign conspired with Moscow to sway the race.

In an earlier tweet on Tuesday morning, Trump suggested that 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's team, which is carrying out the Russia probe, would meddle in the 2018 midterm elections.

"The 13 Angry Democrats (plus people who worked 8 years for Obama) working on the rigged Russia Witch Hunt, will be MEDDLING with the mid-term elections, especially now that Republicans (stay tough!) are taking the lead in Polls. There was no Collusion, except by the Democrats!"

The 13 Angry Democrats (plus people who worked 8 years for Obama) working on the rigged Russia Witch Hunt, will be MEDDLING with the mid-term elections, especially now that Republicans (stay tough!) are taking the lead in Polls. There was no Collusion, except by the Democrats! — Donald J. Trump (@realDonaldTrump) May 29, 2018

Another tweet questioned why Clinton and her campaign were not under investigation, and repeated Trump's frequent claim that Mueller's investigation is a "witch hunt."

"Why aren’t the 13 Angry and heavily conflicted Democrats investigating the totally Crooked Campaign of totally Crooked Hillary Clinton," he tweeted. "It’s a Rigged Witch Hunt, that’s why! Ask them if they enjoyed her after election celebration!"

Why aren’t the 13 Angry and heavily conflicted Democrats investigating the totally Crooked Campaign of totally Crooked Hillary Clinton. It’s a Rigged Witch Hunt, that’s why! Ask them if they enjoyed her after election celebration! — Donald J. Trump (@realDonaldTrump) May 29, 2018

Trump also quoted conservative commentator Mollie Hemingway in another tweet on Tuesday morning in reference to his unproven allegations that the FBI spied on his presidential campaign in 2016.