Billionaire libertarian activist David Koch escalated his battle with Cato Institute President Ed Crane today, releasing a nine-page statement that accuses Crane, among other things, of being a source for Jane Mayer’s 2010 New Yorker hit-piece on Koch Industries.

“Notwithstanding all the wonderful things said about us when soliciting [financial support for Cato], in 2010 Ed became a source for Jane Mayer of The New Yorker, providing negative background on an article that was highly critical of Charles and me,” Koch writes. “As Ed has shown, he will partner with anyone – including those that oppose Cato and what it stands for – to further his personal agenda at the expense of others working to advance a free society,” Koch continued.