Donald Rumsfeld -- One Thing You Can't Defend ... LEBRON JAMES!!

As the former Secretary of Defense, there's one question we HAD to ask Donald Rumsfeld in D.C. yesterday -- IS THERE ANY WAY TO STOP LEBRON JAMES???

The funniest part -- Rummy actually ANSWERS the question!!

The whole exchange is pretty great -- and it's clear, when it comes to the upcoming NBA Finals between the San Antonio Spurs and the Miami Heat ... Donald's riding with the squad from South Beach.