The Globe and Mail reports in its Friday edition that the S&P 500 ended lower on Thursday, as investors grappled with U.S. President Donald Trump's latest trade-tax announcement that hit shares of General Motors and Ford. A Reuters dispatch to The Globe says that on the Toronto Stock Exchange, gains for gold miners offset losses for auto parts and technology shares. Mr. Trump unveiled on Wednesday his plan to implement a 25-per-cent tariff on imported cars and light trucks effective on April 3, while the duty on auto parts begins May 3. Investors are also bracing for a wave of reciprocal tariffs Mr. Trump plans to unveil on Wednesday, although the President has hinted there may be room for flexibility. Prime Minister Mark Carney said that he would respond with unspecified trade actions if Mr. Trump imposes the new auto tariffs. GM tumbled 7 per cent and Ford slid 3.9 per cent. Tesla edged up 0.4 per cent, with investors betting the electric vehicle maker will be hurt less by tariffs because of its largely domestic production. "Even more than the policies, just the constant flip-flopping," said Jed Ellerbroek at Argent Capital in St. Louis, Mo. The S&P/TSX Composite Index ended flat at 25,161.06.