Former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE tweeted his support for Canada late Saturday after 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 attacked Canadian Prime Minister Justin Trudeau.

“Our national security relationship with Canada is vital and saves American lives. It was built over generations and is bigger than any person or dispute. This too shall pass,” Comey tweeted, including a photo of him at Canada’s Parliament Hill.

Our national security relationship with Canada is vital and saves American lives. It was built over generations and is bigger than any person or dispute. This too shall pass. pic.twitter.com/TTOPUf2kjB — James Comey (@Comey) June 9, 2018

Comey has been highly critical of Trump since the president fired him last year, including in his new book “A Higher Loyalty: Truth, Lies, and Leadership.”

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Trump attacked Trudeau in a pair of tweets Saturday after leaving the Group of Seven (G-7) summit, claiming that Trudeau made “false statements” at a news conference and calling the prime minister “very dishonest and weak.”

Trump also said the U.S. would not endorse the joint communique signed by the other G-7 member countries, after Trudeau had said all countries signed it, and appeared to threaten more tariffs against Canada.

Based on Justin’s false statements at his news conference, and the fact that Canada is charging massive Tariffs to our U.S. farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market! — Donald J. Trump (@realDonaldTrump) June 9, 2018

PM Justin Trudeau of Canada acted so meek and mild during our @G7 meetings only to give a news conference after I left saying that, “US Tariffs were kind of insulting” and he “will not be pushed around.” Very dishonest & weak. Our Tariffs are in response to his of 270% on dairy! — Donald J. Trump (@realDonaldTrump) June 9, 2018

The Canadian leader had said at a press conference that his country wouldn’t be “pushed around” by the U.S. over Trump’s recent decision to impose stiff tariffs on steel and aluminum imports from the nation.