Write the right answer to the question based on the context passage.
Q: U.S. President Donald Trump said Saturday that he had instructed his representatives not to sign a communique by all seven leaders attending the G-7 summit in Canada, citing statements by Canada's Prime Minister Justin Trudeau made after he left.
"Very dishonest and & weak," Trump tweeted in response to Trudeau's remark that the new U.S. tariffs on aluminum and steel were "insulting."
"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!" Trump added.
"International cooperation cannot be dictated by fits of anger and throwaway remarks," French President Emmanuel Macron's office said in a statement about Trump's withdrawal from signing the communique. The statement also said Trump's action is a display of "incoherence and inconsistency."
"Germany stands by the jointly agreed communique," Germany spokesman Steffen Seibert said in a statement.
Trudeau closed the summit Saturday by refusing to budge on positions that place him at odds with Trump, particularly new tariffs on steel and aluminum that have irritated Canada and the European Union.
He said in closing remarks that Canada would proceed with retaliatory measures on U.S. goods as early as July 1.
"I highlighted directly to the president that Canadians did not take it lightly that the United States has moved forward with significant tariffs," Trudeau said in the news conference following the two-day summit. "Canadians, we're polite, we're reasonable, but we will also not be pushed around."
British Prime Minister Theresa May echoed Trudeau, pledging to retaliate for tariffs on EU goods. "The loss of trade through tariffs undermines competition, reduces productivity, removes the incentive to innovate and ultimately makes everyone poorer," she said. "And in response, the EU will impose countermeasures."
Trudeau and May also bucked Trump on another high-profile issue: Russia. Trump wants to have Russia — which was pushed out in 2014 over its aggression in eastern Ukraine — rejoin the group. Trudeau said he was "not remotely interested" in having Russia return to the group, made up of the world's seven most advanced economies. Question: Who announced that Canada would retaliate against US tariffs?
A: 
Justin Trudeau