When the students returned to class after Sept. 11, they challenged his assertion.

But none of the publishers in the room, and it was a big one, rose to challenge his assertion.

Trade officials did not challenge assertions that the draft was speculative.

I challenge your assertion that this is an imperfect world.

But he challenged the groups' assertion that torture was widespread and routine.

But at several turns, they challenged the agency's assertion of "numerous serious deficiencies" in their program.

They also challenge the Commissioner's assertion that the surcharge should be considered a fee for service rather than a tax.

Was there any man present to challenge his assertion that the pounds quantity had been tendered?

An equal number of European editors argued that progress could come only by challenging such assertions.

Town officials said that after $800,000 of repairs, the water will soon be drinkable, but residents challenge their studies and assertions.