What action did Trump say Xi Jinping would not take under his presidency?

The assertion that Xi Jinping would not invade Taiwan under Trump's presidency reflects Trump's aim to project strength and a sense of control in diplomatic relations. During his time in office, Trump often emphasized his personal rapport with Xi and expressed confidence that his administration's approach would prevent major conflicts in the Asia-Pacific region, particularly concerning Taiwan. His stance was that a strong U.S. presence and a firm stance against aggressive actions from China would deter such moves.

In contrast, the other options do not align as closely with the narrative Trump was creating at the time. For example, while nuclear weapons and cyber-attacks are serious threats, Trump's focus with Xi was more about trade and diplomatic relations. Tariffs were also a significant part of U.S.-China relations during his presidency, but he did not specifically claim that tariffs would not be imposed in the same context as his discussions about military action regarding Taiwan.