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Prime Minister Justin Trudeau welcomed those fleeing war and persecution on Saturday even as Canadian airlines said they would turn back U.S.-bound passengers to comply with an immigration ban on people from seven Muslim-majority countries.

In pointed tweets a day after U.S. President Donald Trump put a four-month hold on allowing refugees into the United States and temporarily barred travelers from the seven countries, Trudeau said refugees were welcome in Canada.

To those fleeing persecution, terror & war, Canadians will welcome you, regardless of your faith. Diversity is our strength #WelcomeToCanada — Justin Trudeau (@JustinTrudeau) January 28, 2017

A second tweet, also timed to coincide with outrage over Trump’s immigration policy, included a 2015 photo of Trudeau welcoming a Syrian refugee at a Canadian airport.

The hashtag #WelcomeToCanada began trending on Twitter soon after Trudeau issued his tweets.

Confusion abounded at airports around the world on Saturday as officials tried to interpret the new U.S. rules.

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Trudeau has walked a fine line with the Trump administration, avoiding direct criticism while promoting the progressive policies of his one-year-old Liberal government.

READ MORE: Canadians who are dual citizens of countries affected by Trump immigration order can’t go to US

Trudeau‘s press secretary, Cameron Ahmad, said the prime minister is looking forward to discussing Canada’s immigration and refugee policies with Trump.

An email from Trudeau’s office late Saturday said that the U.S. has given assurances that Canadians with dual citizenship will not be turned away at the border.

WATCH: Donald Trump’s travel ban on citizens of seven Muslim-majority countries

WestJet Airlines said it turned back a passenger bound for the United States on Saturday to comply with Trump’s executive order but did not say which country the passenger had come from. Spokeswoman Lauren Stewart said the airline would give full refunds to anyone affected.

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In the western province of Saskatchewan, Mohammadreza Tayfeh was denied entry to the United States but found himself comforting the Delta Air Lines employee he called about a refund.

READ MORE: Air Canada, WestJet waive cancellation fees for travellers affected by Trump travel ban

“I said, ‘It’s all right. It’s going to be fine. Don’t worry about it.’ She was so upset,” he said in an interview from Saskatoon.

Tayfeh, an Iranian citizen an engineering student living in Canada for seven years, had hoped to travel to San Diego to meet with investors for his telecom business. While he had a visitor’s visa, he missed the cutoff to travel by hours.

He decided not to risk flying from Saskatchewan in case he was detained on arrival in the United States. He said an Iranian friend who has been living in the U.S. and working at NASA for years was detained at the Doha airport in Qatar late Friday.

“You don’t want to put yourself in that situation, to go there and they ask you questions and just deport you,” he said.

READ MORE: New York cabbies to halt JFK airport pickups for an hour to protest Trump travel ban

More than any impact on his business, “it really hurts personally,” Tayfeh said. “To label a whole nation as being terrorists? I don’t know what to say.”

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In Vancouver, an employee at the American Airlines counter said one person traveling on an Iranian passport had been turned away Saturday morning.

Air Canada said it was complying with the order but did not comment on whether it had denied anyone travel.

A spokesman for Porter Airlines said the Toronto-based carrier will be restricting passengers from traveling to the United States from the listed countries until further notice.