Trump has heaped criticism on automakers for building cars in Mexico and elsewhere and threatens to impose 35 percent tariffs on imported vehicles. The message was then retweeted by the account of the President of the United States. General Motors, Ford and Fiat Chrysler are all posting gains, with Fiat Chrysler leading the way.
He went after Ford on the campaign trail more aggressively than others.
While Trump has criticized American auto makers for being, in his view, too willing to move operations to other countries, he told his White House guests the government will try and make it easier to build plants in the United States.
Trump's tweeting in particular is a concern for auto industry executives, as many admit they're not very familiar with the social media platform. The company blasted the EPA and said it had done nothing illegal. Mr Trump has openly agitated for U.S. automakers to keep jobs in the USA and cancel plans to build plants overseas.
Auto industry executives have their first meeting with President Donald Trump on Tuesday, but they've already always been pondering how they'll work with the new president.
"We're bringing manufacturing back to the United States big league", Trump said following the meeting.
Ford CEO Mark Fields appears to have gained even more enthusiasm for the plan after attending the latest gathering. Trump, a NY real estate developer, often singled out Ford's Mexico investments for criticism during his election campaign.
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ET (1521 GMT), the Toronto Stock Exchange's S&P/TSX composite index was up 161.87 points, or 1.05 percent, at 15,571.68. Northern Dynasty Minerals Ltd. (NYSE:NAK) shares moved to $2.96 after starting the day at $2.78 on Monday.
Leaders of Ford Motor Co, Fiat Chrysler Automobiles NV and General Motors Co met Mr Trump at the White House, the most recent in a series of meetings this week aimed at bolstering the United States manufacturing sector.
Meanwhile, House Speaker Paul Ryan told reporters yesterday that he has invited Mr Trump to address a joint session of Congress on Feb 28.
CEO Sergio Marchionne joined Trump at the White House, where regulatory reform, corporate taxes and trade were topics of discussion.
Mark Fields, the CEO of Ford, said the industry is encouraged by Trump's economic proposals.
"It's the long-term jobs that we are looking for", he told the executives. "You'll either get or not get the permits, you'll find out fast".
'And it's absolutely insane, ' he said. When meeting the chief executives of General Motors, Ford Motor Co. and Fiat Chrysler, he specifically targeted environmental regulations, which he called "out of control". "So we're gonna be very friendly". And we're going to either give you your permits or we're not going to give you your permits. But Mr Trump's order freezes funding to non-governmental organisations in poor countries if they offer abortion counselling or advocate the right to seek abortion in their countries.