Sept 20 (Reuters) - Canada’s main stock index fell to a one-month low on Monday as global growth worries dented oil prices, while all eyes were on a federal election where Prime Minister Justin Trudeau could cling to power but looked set to lose his bid for a majority. At 9:32 a.m. ET (1332 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 326.74 points, or 1.59%, at 20,163.62 and was on course for its worst session since January. The energy sector sank 3.1% as U.S. crude prices were down 1.5% a barrel. U.S. stock indexes also tumbled more than 1% as investors fretted about the Federal Reserve potentially beginning to taper its stimulus at a time when macroeconomic data suggests a slowdown in global growth. (Reporting by Sagarika Jaisinghani in Bengaluru; Editing by Amy Caren Daniel)