In the 6th century, they challenged the power of China.

"Her very first action is to challenge his power," explains the director.

Neither is in any position to challenge Washington's conventional military power.

No civilian president has been able to challenge the power of the army seriously.

However, four individuals form a secret alliance to challenge the government's power.

This current structure challenges the power and decisions of the Chairman.

The only assembly that might have challenged his power had now broken in two.

Congress is similarly reluctant to challenge the bond market's power.

He slaughtered 20,000 of them when they challenged his power two decades ago.

One of the world's best-known athletes is challenging his power.