Black, Bennett, Hanson: Biden, China and Taiwan – how will president respond if ally is attacked?

As China steadily raises the pressure on Taiwan, curiosity intensifies about the likely U.S. reaction in the event of an outright military invasion of Taiwan by the People's Republic.

But if in such an eventuality the American response was confined to the usual diplomatic remonstrations and no direct combat assistance, it would be rightly seen by the world as a humiliating climbdown by the United States – with devastating fallout additionally for our allies in the region, especially Australia, Japan and South Korea.