I hope he wasn't trying to use Article VI, Clause 3 to claim what Trump was doing was unconstitutional. That clause said no religious test can be used as a qualification for holding pubic office or a position of public trust. I hope he wasn't trying to use Article I, Section 8, Clause 4 dealing with naturalization because Congress has the authority to regulate rules for naturalization and immigration as determined by the SCOTUS. Nothing limits them from using whatever they want to limit that and keeping someone out for religious reasons doesn't violate Article 6 since someone coming here isn't running for office.
Liberals claim they've read the Constitution and still can't show specific words in it they claim it has.
Actually Khan's words were: "Have you even
read the United States Constitution?" While that doesn't refer to any particular Article, clause or issue (it refers to the whole thing) ---- it is a very valid question begged by myriad Rump declarations, such as most blatantly, this one:
That's Amendment Number One, the building block of the whole Concept, being dissed into the same bag with "rapists" and "pigs" and "losers". So the answer to Khan's question would appear to be "No".