Justin Trudeau, Donald Trump's neighbour to the north, has a $500bn problem — how to keep Canada's most important economic relationship on track when he is at odds on so many issues with the new occupant of the White House.
There are many contrasts between the Canadian prime minister — a 45-year old self-declared feminist who campaigned an optimistic message of "sunny ways" — and the 70-year US president who won power on a platform of protectionism and immigration curbs.
In policy terms, potential flashpoints include the North American Free Trade Agreement, which Mr Trump blames for the loss of US jobs and which he has pledged to overhaul; immigration, with Canada pledging to admit 25,000 Syrian refugees this year; and climate change as Mr Trudeau looks to push through a carbon tax plan while Mr Trump reverses course in the US.
"Although Trump's actions in the past few weeks are what he said he would do, they still come as a shock," said Roland Paris, one of Mr Trudeau's top foreign policy advisers during his 2015 election campaign and first months in office.
The challenge for Mr Trudeau is to keep faith with Canadians — who largely disapprove of Mr Trump, according to recent polls — while preserving his country's $500bn annual trade relationship with the US.
"It is common sense" not to endanger the relationship, said Paul Frazer, former Canadian ambassador to the US.
The prime minister could only watch as Mr Trump fired off a barrage of executive orders, including a travel ban barring people from seven predominantly Muslim countries from entering the US. The ban, currently suspended pending litigation in the US courts, even raised questions about whether Ahmed Hussen, Ottawa's own immigration minister and a former Somali refugee, could still cross the two nations' shared 9,000km border.