Republican John McCain said the desire by Democratic presidential rivals Hillary Rodham Clinton and Barack Obama to renegotiate the North American Free Trade Agreement would jeopardize crucial military support from Canada. McCain used a town-hall style meeting Friday at Dell Inc. headquarters to emphasize his support for NAFTA. The effects of the 1994 trade pact are still hotly debated, but studies indicate the deal has resulted in record exports from Texas to Canada and Mexico.
