The U.S. can only go so far with China before the dollar is called into question, Edward Price writes in a guest commentary.

Republican presidential candidate Donald Trump said he would impose additional tariffs on China if China were to "go into Taiwan," the Wall Street Journal reported.

On the campaign trail, Trump has rarely mentioned the threat of a potential trade war, in which foreign nations could respond to tariffs by slapping U.S. imports with taxes of their own. Economists who spoke to ABC News said Trump's tariff proposals would all but certainly trigger a global trade war,