Gaffney said that Ali Tulbah arranged for the American Muslim Council to attend a White Houe meeting, based on the AMC's press release thanking him for doing so. Norquist denied it, and called Gaffney a racist and a bigot for even making the suggestion.
Yet, as the link above at #28 confirms, the AMC did, indeed, thank Ali Tulbah for arranging the White House meeting, exactly has Gaffney charged.
You've asked for evidence. It was provided. You ignored it. You were reminded. You ignored it again.
There are links upon links here, sources upon sources. You've posted nothing of substance.
Gaffney made a charge, and the evidence for it was exactly where he said it was. If there's slander or libel here, it's Grover Norquist who is guilty of it.