What gives me hope is we don’t need to be doing any of these policies. They can be undone relatively easy if congress would just step up."

Three weeks after US President Donald Trump effectively declared a trade war with the whole world, new economic forecasts and surveys will point to the initial fallout.

The effects of President Trump’s new tariffs are starting to be felt across the world, preliminary South Korean trade data suggest, as Seoul prepares to begin negotiations with Washington.