i went to the trouble to search for the first known example to provide a historically salient version. I shortened it slightly because it had been written as a dialog with lots of quotation marks, but i kept the unique phraseology. google the wording I used and you will find it on books.google.com 1911 before any of the usual suspects could have said it.
I gave the short version in addition to voting you up because it is memorable, and I thought that someone out there might wonder why it sounded familiar.
If the facts are with you, pound on the facts. Else if the law is with you, pound on the law. If neither is with you, pound on the table.