Canadians have become more supportive of NAFTA since Trump's election victory on Nov. 8, a poll from the Angus Reid Institute showed on Monday. Forty-four percent of the 1,508 surveyed said NAFTA had benefited Canada, up from 25 percent from a poll last June.
Trudeau, when asked about Canadian firms' concerns about possible changes to NAFTA, said: "It is a real concern for many Canadians because we know our economy is very dependent on our relationship with the United States.
"Goods and services do cross the border each day...we have to allow this free flow of goods and services and we have to be aware of the integration of our economies."
Trudeau had a strong rapport with former Democratic President Barack Obama, prompting pundits to describe their relationship as a "bromance."
Soon after Trump put a hold on allowing refugees into the United States and temporarily banned travelers from seven Muslim-majority countries in an executive order on Jan. 27, citing the need to head off attacks by Islamist militants, the Canadian prime minister took to Twitter to say refugees were welcome in Canada.
'POLICY OF LAYING LOW'
Still, analysts said Trudeau has strong incentives to build a relationship with Trump given rising anti-trade sentiment.
"You don't have to be a genius to see there are some stark differences between them," said Duke University professor Stephen Kelly, former U.S. deputy chief of mission to Ottawa.
"But is this the time to be poking people in the eye? I would say it is not. ... In some ways the president is a guy for whom personal relationships may be even more important."
Canadian pollster Nik Nanos said Trudeau, who remains popular at home more than a year after winning a surprise Liberal majority government, faces the same pressure all Canadian leaders do when they engage with U.S. presidents: keep the economic ties tight but do not appear too chummy or subordinate.
Nanos expects that Trudeau, if asked, will speak about how Canada is welcoming refugees or seeking to expand free trade, without saying anything critical about Trump's point of view, conscious that the president has not hesitated to take an aggressive tone with other world leaders.
"This meeting is more about avoiding pitfalls than trying to engage on some of the big issues," Nanos said. "It's definitely the policy of laying low."