But I am not unaware of some of the pitfalls in that invitation. I am not unaware of the fact that far too many Americans have not quite made the considered judgments that they ought to make on the difference between the merits of the systems as between the Communist world and the free world. But this business of denying visas to eminent members of the medical profession or scientific communities when they are to be here for the specific purpose of attending scientific conferences makes the United States look a little ridiculous. * This is the most powerful nation the world has ever known. We feel strong enough to permit the top officialdom of the Communists to come to see us. The President invites Khrushchev to come and see our military installations. to see our great bomber fleets. without worrying that it may in any way jeopardize our security.