Former president Donald Trump on Wednesday appeared to open the door to significantly expanding his plans to impose sweeping new tariffs if he returns to office, suggesting an escalation in proposals that many experts already see as likely to cause a global trade war.

Previously, the Republican presidential nominee had called for levying tariffs of 10 percent on all U.S. trading partners, aiming to create a “ring around the collar” of the national economy. But during remarks on the economy in Asheville, N.C., Trump for the first time floated tariffs of between “10 and 20 percent” on imports to the United States.