assert the contrary

See: contradict
References in classic literature ?
You are more horned than a unicorn if you assert the contrary.
Thus, although proposed intervenors assert the contrary, they have not demonstrated how they have more than a general interest in the enforcement of a state constitutional provision which could easily be shared by all Kentucky residents.
While the economy of our country has better indicators than many developing and developed countries, to assert the contrary serves no goal, but muddies the water," he maintained.
There will be those who argue that the maintenance of non-state weapons benefits the Lebanese, and those who assert the contrary.