Does knowledge secure warrant to assert?

This paper fortifies and defends the so called Sufficiency Argument (SA) against Classical Invariantism. In Sect. 2, I explain the version of the SA formulated but then rejected by Brown (). In Sect. 3, I show how cases described by Hawthorne (), Brown (), and Lackey (forthcoming) threaten to undermine one or the other of the SA's least secure premises. In Sect. 4, I buttress one of those premises and defend the reinforced SA from the objection developed in Sect. 3. [ABSTRACT FROM AUTHOR]