Most Japanese firms think a Donald Trump presidency would harm the Japan-U.S. security alliance and make the United States a less attractive place to invest, a Reuters poll showed, in a further sign of international angst about his candidacy.

The Republican front-runner, known for his unpredictable style and fiery rhetoric, would also cause bilateral trade to shrink if he became president, a majority of respondents said.

Portraying Japan as a free-rider on security, Trump has suggested that the U.S. ally might need nuclear weapons to ease the U.S. financial commitment to its defense — anathema to the only country ever attacked by atomic bombs.