Former CIA Director Michael Hayden on Monday blasted 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 for the attacks he directed at Canadian Prime Minister Justin Trudeau, saying they make Trump look "unstable, erratic and thin-skinned."

“One of the arguments was that the president can’t show weakness, and that what Trudeau did required this robust response otherwise the president would appear to be weak as he flew to Singapore," Hayden said on CNN's "New Day."

"Trudeau did not make President Trump look weak. President Trump made President Trump look unstable, erratic and thin-skinned," added Hayden, who also served as director of the National Security Agency (NSA) under former Presidents Clinton and George W. Bush.

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Trump launched a series of attacks at Trudeau this weekend as he departed a meeting of the Group of Seven (G-7) industrialized nations in Canada. After Trudeau stated during a news conference that Canada was prepared to impose retaliatory tariffs on the U.S., Trump responded that he would not sign a joint statement issued by G-7 attendees at the conclusion of the weekend's summit.

Trump also called Trudeau "dishonest and weak" and accused him of changing his tone only after Trump had left the summit. The sentiment was echoed by two of the president's top advisers on Sunday, who claimed Trudeau stabbed the U.S. in the back.

Hayden said he reacted to the events of this weekend with “a mixture of sadness and, frankly, anger because no country deserves to be treated that way.”

“Certainly having officials in one government criticize the head of government in another country, I don’t think I’ve ever seen that before, and for god's sake, doing it against Canada after the prime minister issued a fairly mild statement about the Canadians just standing their ground and then to have him attacked on the Sunday morning talk shows," he added.

Hayden also scoffed at the idea that Trump's actions were part of an elaborate strategy as the president prepares for an historic summit with North Korean leader Kim Jong Un on Tuesday.

Asked if there was "any strategic value," Hayden responded, "Oh my god, no."

Hayden has ramped up his critiques of the Trump administration in recent months. In May, he said North Korea was not prepared to give up its nuclear weapons and that if Trump demands something like that, the negotiations will "end up in a very bad place.”