President Trump left the G7 after firming up a trade deal with the United Kingdom. But he hinted at roadblocks on other fronts, saying Tuesday that Japan was being "tough" in trade talks and the European Union has failed to offer a fair deal.

Japan has reported its exports fell in May as shipments of autos to the U.S. dropped nearly 25% from a year earlier due to higher tariffs imposed by President Donald Trump.

TOKYO—Japan’s exports fell for the first time in eight months in May, bolstering views that the impact of President Trump’s tariffs could tie the Bank of Japan’s hands on rate hikes. Exports, a main engine of growth for Japan’s economy,