Following two days of intense discussion at this year’s annual Group of 7 summit in Canada, President Donald Trump intensified his rhetoric against Canadian Prime Minister Justin Trudeau, calling him “very weak and dishonest” after threatening to escalate a trade war between the United States and our country’s closest neighbors.

In a tweet storm aboard Air Force One while on his way to the Singapore summit to meet with North Korean dictator Kim Jung-Un, Trump unloaded on Trudeau, accusing him of making false statements on trade to the news media.

Trump also took a stab at Trudeau’s candor after the Prime Minister called U.S. tariffs on Canada “kind of insulting” in a press conference he gave after the forum’s conclusion. Trump taunted him for not bringing this critique up during deliberations.

Though Trudeau had acknowledged that disagreements remained between Trump and leaders of the other member nations, he took pride in saying that some ground had still been made. Specifically, in terms of global economic diplomacy, he cited that broad agreements had been reached on a series of foreign and economic policy goals while the leaders were convened.

Trudeau and other world leaders in attendance, however, remained unable to change Trump’s mind concerning the new round of tariffs on steel and aluminum imports into the United States prompting Trudeau, along with members of the European Union impacted by this new wave of tariffs, to vow to implement proportional tariffs in response.

Cameron Ahmed, a spokesperson for Trudeau, responded to the president’s Twitter remarks, doubling-down on the Canadian prime minister’s message. “We are focused on everything we accomplished here at the summit… the prime minister said nothing he hasn’t said before – both in public, and in private conversations with the president.”

The president has been actively pushing the idea that the U.S. has a trade deficit with Canada during the renegotiation of the North American Free Trade Agreement (NAFTA) between the United States, Canada and Mexico. Though he claims the United States is being used as the worlds “piggy bank,” the U.S. actually had a $2.8 billion surplus with Canada last year.