Is Larry Summers flirting with protectionism?

Amidst a critique of Obama’s economic transition team, Willem Buiter says that Larry Summers is over the line: “Larry Summers has stepped repeatedly over the boundary between legitimate critiques of certain extravagant claims concerning the joys of globalisation and simple trade protectionism.”

Summers has at times specifically warned against protectionism, but others have also been unhappy with his recent writings on the liberal international economic order. Is Summers over the line? A few links or citations would make Buiter’s complaint more persuasive.