The objection to the claim is that it is mere assertion or, more kindly, an act of faith.

Those lawsuits have now failed in the trial courts but the Administration's war powers claims are left as mere naked assertions.

This sounds like a defense lawyer who hopes to convince a skeptical court of his client's "innocence" by mere assertion.

Could the mere assertion of a claim effect so much of a change?

But his record as Governor and candidate show that he occasionally confuses mere assertion with real accomplishment.

I think that there are, Protarchus; but this is an opinion which should be well assured, and not rest upon a mere assertion.

To the contrary, they are mere assertions of power, and expensive ones.

The least one can say is that such a contention needs rational argument and not mere assertion.

This is when argument is needed, not mere assertion.

Just signing a form that states that one would like the list of one's benefits considered is not evidence but mere assertion.