Because the clear implication is that Saddam was seeking uranium for nuclear weapons, which would be a clear threat to the security of the United States.
Now even the flimsy justifications we've been given for Saddam's nuclear capabilities are collapsing.
From Charles Hanley of the AP via the San Jose Mercury News:
A top U.N. weapons hunter says it would have been "virtually impossible" for Iraq to revive a nuclear bomb program with equipment recently dug up from a Baghdad backyard, as the Bush administration contends.
Jacques Baute said the long-term monitoring of Iraq's nuclear establishment planned by the U.N. Security Council would have stifled any attempt to build a huge uranium-enrichment plant for making bomb material.
"This is a mistake people are making," Baute said. Such contentions ignore the fact that Iraq would have operated for years under international controls had the U.N. plan not been aborted by war, he said.
Baute also said in an interview with The Associated Press that it appears the unearthed cache of uranium enrichment parts, surrendered by an Iraqi scientist last month, lacked critical components, and its accompanying blueprints were marred by errors.
Bush lies, soldiers die.
NOTE: Thanks to alert reader David E. for reminding me of the appropriate Monty Python. Reminds me on one of Ari's press gaggles. Don't let the door hit you on the way out, Ari.