Story highlights The presumptive Republican nominee was talking trade in New Hampshire

Trump has made building a wall along the U.S.-Mexico border a centerpiece of his economic platform

Washington (CNN) Donald Trump's latest jab at Mexico is taking off.

As a plane flew overhead at Trump's Thursday afternoon town hall in Manchester, New Hampshire, Trump said, "That could be a Mexican plane up there -- they're getting ready to attack."

Trump was talking trade in New Hampshire, touting his plans to renegotiate the North American Free Trade Agreement, which he said has allowed Mexico to siphon away U.S. manufacturing jobs.