This is laughable. The only information available to these lawyers is that from documentation on declared income, documentation provided to them by Trump. Trump is a con man, and the Russians are masters at hiding money. There are countless ways that money could be funneled to the Trumps through 3rd parties; money laundering is nearly a Russian state business. Graham is simply asking Trump for a flimsy excuse to call himself satisfied, and close out any investigation into Trump’s financial entanglements with the Russian.