U.S. stocks were poised to record their biggest one-day drops in roughly seven weeks on Wednesday, as worries about rising Treasury yields and the potential outcome of the upcoming Nov. 5 presidential election weighed on investors.

Asian stocks were mixed on Wednesday under pressure from a rising U.S. dollar and the uncertainties over the U.S. election. U.S. futures and oil prices fell due to escalating geopolitical tensions after Israel announced that an airstrike outside Beirut earlier this month killed a Hezbollah official who had been expected to succeed the group’s longtime leader after he died in an Israeli strike last month.