Cambodia will scrap tariffs on US goods and pledged to buy as many as 20 Boeing Co. 737 Max jets in a bid to narrow its trade gap with Washington, according to Deputy Prime Minister Sun Chanthol.

Countries that have not received a prior letter on tariffs from Trump or negotiated a trade framework will be notified of their likely tariff rates, Leavitt said, either in the form of a letter or Trump’s executive order. At least two dozen countries were sent letters setting out their tariff rates.