It is possible, but by no means certain, that China is targeting the United States with an exact duplicate of America's most advanced nuclear warhead, the W-88. It is possible, but by no means certain, that China was handed that ability by a traitor working at Los Alamos National Laboratory.
China does have such a weapon, it readily admits.
But it takes umbrage at the insinuation that the only way it can develop advanced technology is to steal it. It built the warhead all by itself, insists its president, Jiang Zemin. And indeed, other nations have developed similar warheads independently, and it's just a matter of time before more do. Unfortunately, Republicans in Congress succeeded in turning this issue into a highly charged political football. Today it seems abundantly clear the FBI centered its efforts on the hapless Wen Ho Lee, a former nuclear scientist at Los Alamos, because he was the first and likeliest suspect they looked at.