U.S. President Donald Trump accused China on Wednesday of targeting American farmers in a "vicious" way and using them as leverage to get trade concessions a day after the administration announced a $12 billion farm aid package.

China and other top U.S. trade partners zeroed in on American farmers with retaliatory tariffs after the administration imposed duties on Chinese goods as well as steel and aluminum from the European Union, Canada and Mexico.

Farmers are being targeted since they rely on export markets for agricultural produce and have broadly supported Trump. As the dispute escalates, China and other importers have slapped tariffs on incoming shipments of U.S. soybeans, dairy, meat, produce and liquor.