CAMP DAVID, Md.  President Bush on Saturday dismissed assertions that his administration had softened demands that North Korea fully declare all of its nuclear activities, including secret efforts to enrich uranium and sell nuclear technology abroad.

Appearing here at the presidential retreat with South Korea’s new president, Lee Myung-bak, Mr. Bush said that any judgment about North Korea’s willingness to dismantle its nuclear program  the core of an agreement negotiated last year  would only come once North Korea completed a declaration of its nuclear activities.

The deadline for that declaration passed at the end of last year, and no new deadline has been set. That has left the agreement signed 14 months ago by North and South Korea, the United States, China, Japan and Russia increasingly in doubt.

Mr. Bush, facing criticism from some conservatives, distanced himself from statements by administration officials that the United States and other countries were prepared to accept something less than a full admission about North Korea’s secret nuclear programs.