Under the bounds of the pacifist Constitution, Japan will likely have only limited options such as providing logistical support under a special law, as was seen in the aftermath of the terror attacks on the United States on September 11, 2001, the officials said. It is uncertain whether President Donald Trump would turn to Japan for help as Washington has increasingly pointed to threats from Iran. But Trump has said that what he perceives as an "unfair" bilateral security treaty should be changed, while denying he would scrap it.