Prior to the attack, the possibility of Trump's return to office had already led to a stronger dollar and investors positioning for a steeper yield curve in U.S. Treasuries. These market movements are expected to gain further momentum, according to Rong Ren Goh of Eastspring Investments.

The shooting marks the first time a U.S. president or major party candidate has been shot since the attempt on President Ronald Reagan's life in 1981.