OTTAWA (Reuters) - Canada is considering all options, including providing financial aid to the auto industry, to cope up with possible U.S. tariffs, a senior federal minister said, even as officials expressed doubt Washington would follow through with a threat to impose the punitive measures.

FILE PHOTO: Canadian Minister of Innovation Science and Economic Development, Navdeep Bains, introduces Blackberry CEO John Chen (not pictured) at the North American International Auto Show in Detroit, Michigan, U.S., January 15, 2018. REUTERS/Rebecca Cook

U.S. President Donald Trump last month said he might impose tariffs of up to 25 percent on foreign-built automobiles, which could cause major economic damage to Canada and a heavily integrated North American industry.

After Trump slapped tariffs on Canadian steel and aluminum on May 31, government ministers promised to support the sectors, and Innovation Minister Navdeep Bains told Reuters the same kind of aid could be ready for the auto industry.

“We’re examining all options ... our view is that if any such action is taken, we’re going to support our workers,” he said in an interview last week.

“The message I would convey to the auto sector workers is - we have your backs.”

The bill could run into billions of dollars, depending on the extent of government support for the industry, which represents about 500,000 direct and indirect jobs and contributes around C$80 billion ($60.5 billion) to the economy a year.

Last year, Ottawa responded with a package worth C$867 million after the United States imposed tariffs on softwood lumber exports.

A Scotiabank analysis released Friday said steel and auto tariffs would knock growth in Canada down to 1.2 percent in 2020 from 2.1 percent in 2018, enough to force the Bank of Canada to cut rates.

Prime Minister Justin Trudeau is already under pressure for breaking a promise to balance the federal budget by 2020. Ottawa says there is now no target date for eliminating the deficit.

Trudeau’s Liberals will need support from auto sector workers to win re-election in October 2019.

“We’d need to have an aid package; that’s for damn sure,” said Jerry Dias, head of the influential Unifor private sector union, when asked about auto tariffs.

Trudeau - in remarks to Reuters and other media outlets - said he thinks the auto tariffs threat is designed to gain leverage at talks to update the North American Free Trade Agreement (NAFTA) pact, where Canada and Mexico are resisting U.S. demands for major changes.

One Canadian government source, noting that an automobile crosses the countries’ shared border six or seven times before it is completed, suggested the threat was unworkable.

“When would you impose the tariff - the first time? The fifth time? The seventh time?” asked the official, who asked to remain anonymous given the sensitivity of the situation.

($1 = 1.3219 Canadian dollars)