"Actually, this occurred in December 1975. Novak, with his late partner Rowland Evans, got the classified leak -- that President Gerald R. Ford and Secretary of State Henry Kissinger were ready to make concessions to the Soviet Union to save the SALT II treaty. Donald H. Rumsfeld, then, as now, the secretary of defense, intervened to block Kissinger.

"The main leak suspect: Richard Perle, then an influential aide to Sen. Henry "Scoop" Jackson (D-Wash.) and now a member of the Pentagon's Defense Policy Board and a confidant of neoconservatives in the Bush administration. The account was described in a 1977 article in The Washington Post, noting Perle's "special access" to Evans and Novak.

Apparently this info was dug up by a "new" "liberal" think tank called the Center for American Progress.