Mark Carney sworn in as first new Canadian prime minister in nine years

Mark Carney, an economist and political newcomer, has been sworn in as Canada's new prime minister and delivered a speech vowing to "never" become a part of the United States.

He takes office on Friday just days after being elected leader of the governing Liberal Party and amid an ongoing trade war with US President Donald Trump.

"We know that by building together, we can give ourselves far more than anyone else can take away," he said remarks after the ceremony.

Carney replaces outgoing Prime Minister Justin Trudeau, who was in office for nine years, after a landslide victory in last week's Liberal leadership race.

"We will never, in any shape or form, be part of the US," Carney said told reporters in Ottawa on Friday, referring to Trump's musings that Canada join the US as its "51st state".

"We are very fundamentally a different country," he said, later adding the notion is "crazy".

He declined to answer questions about the timing of Canada's next federal election - currently scheduled for October - but hinted he would move quickly to seek "as strong a mandate that is needed for the time".

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In his first order as prime minister, Carney moved to end a policy that had been frequent attacked against by political opponents.

He ended the consumer carbon pricing programme - a key environmental policy under Trudeau that had become deeply unpopular in recent years amid high inflation.

Conservatives have criticised the tax, saying it raised the price of goods and energy for Canadian families.

At an afternoon cabinet meeting, Carney said his government will still take steps to fight climate change. An industrial carbon tax on large emitters remains in place.

Canadians receive a rebate to offset the cost of carbon pricing and will get their final cheque in April.

Canadian politics in recent months have largely been overshadowed by the trade war Trump launched after taking office in January - and with a general election on the horizon, Carney is expected to pitch himself as the best equipped candidate to take on Trump.

He previously held roles as governor of the Bank of Canada, the country's central bank, and of the Bank of England, and helped both countries weather major financial disruption.

He intends to travel to the UK and France as his first foreign trip as PM next week.

Carney said he also looks forward to speaking with Trump.

"We respect the United States. We respect President Trump," he said after the swearing in ceremony.

"President Trump is has put some very important issues at the top of his agenda."