Cheng's comments come as Taiwan awaits approval on a $14 billion arms package from the U.S., and as uncertainty lingers over Washington's long-term commitment to the island's defense.
The visit takes place ahead of President Trump's own summit with Chinese leader Xi Jinping next month, where Taiwan is expected to be a top agenda item.
A recent U.S. intelligence report reignited an already contentious debate in Taiwan over China's intentions and how Taipei should reasonably defend itself against its powerful neighbor.
Escalation of the Iran conflict is sending shockwaves through global markets — driving up oil, fuel, and commodity prices, stoking inflation and recession risks worldwide. We hear from three NPR reporters in Europe, Asia and Russia.