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 Thursday described it as “ironic” that the special counsel probe into Russian interference in the 2016 election continues as he prepares to meet with foreign leaders in Canada and Singapore.

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"Isn’t it Ironic? Getting ready to go to the G-7 in Canada to fight for our country on Trade (we have the worst trade deals ever made), then off to Singapore to meet with North Korea & the Nuclear Problem...But back home we still have the 13 Angry Democrats pushing the Witch Hunt!" Trump tweeted.

Isn’t it Ironic? Getting ready to go to the G-7 in Canada to fight for our country on Trade (we have the worst trade deals ever made), then off to Singapore to meet with North Korea & the Nuclear Problem...But back home we still have the 13 Angry Democrats pushing the Witch Hunt! — Donald J. Trump (@realDonaldTrump) June 7, 2018

Trump has taken to labeling 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 as a a collection of “13 angry Democrats,” despite the fact that Mueller himself is a Republican.

He has frequently bashed the special counsel investigation as a "witch hunt" and a "hoax."

Four former Trump associates have pleaded guilty or been indicted in Mueller's probe thus far. The special counsel also filed charges against 13 Russians for alleged meddling in the 2016 election.

The president's latest attack on the investigation comes as he prepares for a slew of meetings with foreign leaders.

Trump will meet Thursday with Japanese Prime Minister Shinzo Abe, then will depart Friday for the G-7 Summit in Canada. He is expected to meet there with Canadian Prime Minister Justin Trudeau, British Prime Minister Theresa May and French President Emmanuel Macron, among others.

The G-7 comes a short time after Trump imposed steep steel and aluminum tariffs on Canada, Mexico and European allies, prompting growing concerns of a global trade war. U.S. lawmakers and foreign leaders have criticized the tariffs, but Trump has been unfazed, arguing the U.S. “can only win” in a trade war.

Following the G-7, Trump will travel to Singapore to meet with North Korean leader Kim Jong Un. The historic summit will take place on June 12, as the U.S. presses North Korea to fully abandon its nuclear program.