call somebody's bluff

Over the past few weeks, the president has called their bluff.

He'd just have to go ahead and call her bluff.

But either way, they've given us a chance to call their bluff.

He really has no choice but to call China's bluff.

But a man in front of me called his bluff.

Taken by the idea, he decided to call his own bluff.

And you would know that at last he had called his own bluff.

They weren't going to risk calling my bluff with all these people around.

It seems to me that God has called your bluff.

"I ask those with the authority to call his bluff and let him walk away."