Nancy Pelosi may visit Taiwan next month, in what would be the first trip to the island democracy by a House Speaker in 25 years. It would be an important display of U.S. support, and maybe she’d come away realizing that Taiwan needs better defenses.

The Financial Times broke the news of Mrs. Pelosi’s trip, which her office hasn’t confirmed but which still has China upset. Foreign Ministry spokesman Zhao Lijian said Tuesday a visit would “have a severe negative impact on the political foundation of China-U.S. relations.” He warned that “China will take strong and resolute measures to safeguard its sovereignty and territorial integrity.”