President Donald Trump’s two-tiered trade deal with Vietnam aims squarely at practices China has long used to skirt US tariffs: The widespread legal shifting of production to Southeast Asian factories and the murkier and illegal “origin washing” of exports through their ports.

Vietnam, whose exports to the U.S. reportedly comprised 30% of its gross domestic product last year, is especially vulnerable to Trump's tariffs.

American goods will enter Vietnam duty-free in exchange for lower tariffs, the president says.