President George W. Bush is calling it "naive" to argue that Iran couldn't transfer nuclear enrichment knowledge from any energy development to atomic bomb production. Bush rejected arguments from some that Iran's nuclear activities are intended only for a civilian energy program. Speaking with British Prime Minister Gordon Brown after meetings Thursday at the White House, he called Teheran "untrustworthy." And even if Iran's claims are true, Bush said it "is, in my judgement, naive" to assume they could not transfer that knowledge to a military program. Brown said "I make no apology" for urging new sanctions on Iran if it does not cooperate with international demands to halt uranium enrichment.