WASHINGTON (AP) — President Donald Trump is lobbing new threats against U.S. trade partners.

Trump says Sunday on Twitter that the U.S. is "insisting" that countries remove "artificial" trade barriers and tariffs on U.S. imports to their countries "or be met with more than Reciprocity by the U.S.A." He says "Trade must be fair and no longer a one way street!"

Trump already has strained relationships with North American and European allies by imposing tariffs on steel, aluminum and other products from those countries.

At the conclusion of a meeting of the world's leading economies last month, T...