Canada's main stock market fell on Friday as investors are worried about US President Donald Trump's threat of tariffs on Mexico.

Trump's threat also spelled the potential for chaos for the US Congress approval of USMCA (United States-Mexico-Canada Agreement) trade deal, which was negotiated as a replacement to NAFTA (North American Free Trade Agreement) between the United States, Mexico and Canada.

Meanwhile, Statistics Canada said Friday morning that the Canadian economy grew slower than expected in the first quarter despite signs of a strong recovery in March.

The Toronto Stock Exchange's benchmark Standard & Poor's/TSX Composite Index fell 51.75 points, or 0.32 percent, to close the week at 16,037.49 points.

On the market, a total of 97 issues rose while 141 fell. There were four new highs and 17 new lows, with total volume of 224.2 million shares.

Eight of the index's 11 major sectors were lower due to fall for both the heavyweight financial and energy sectors.

The energy sector fell 1.65 points, or 1.1 percent, while the financial group dropped 3.12 points, or 1.0 percent.