There is no one else in the county who has come up to challenge our claim of being the first.

He didn't know what he'd have done if the older man had challenged his claim.

And so far, the international community has been unwilling to challenge China's claim.

There have been several reports challenging the government's claims about the costs and benefits of the plans.

New York has a standard procedure for property owners who want to challenge a town's claim, which the couple followed.

The report challenges the Government's claims that generating energy from wind power will be cheaper in the long run.

However, Read challenged such claims, and his assertions have been generally accepted.

Instead of challenging such claims, architecture schools today have become factories for manufacturing them.

But he was able to speak because no delegation challenged his claim to represent Panama.

One way is to challenge claims that the pharmaceutical industry needs high prices to innovate.