 We have looked at a number of attempts to reconstruct a Putnamian anti-skeptical argument that uses Putnam’s causal constraint to refute the skeptical argument that is based on both the brain-in-a-vat scenario and the closure principle (CP). Most of the anti-skeptical arguments we looked at used the principle of disquotation in various ways, and as a result, these arguments begged the question in similar ways to Brueckner’s original reconstruction of Putnam’s argument. Some of these arguments begged the question in a different way, pointed out by Hale (2000).