Japanese conservatives, initially hopeful for renewed ties under Trump, are now shocked by the state of the bilateral relationship and global uncertainties. The conflict in Iran has been a turning point for some supporters.

In the weeks leading up to Donald Trump’s second inauguration, conservatives in Japan were delighted and hopeful that his return would usher in robust economic growth, new trade opportunities and a stronger security relationship with Tokyo. Now, barely 18 months later, many of the conservatives admit to being shocked at the state of the bilateral relationship and mounting global uncertainties due to the US president’s policies. The conflict that he started in Iran was the final straw for some of...