You might have thought that the White House had enough on its plate late last month, what with its search for a new Supreme Court nominee, the continuing war in Iraq and the C.I.A. leak investigation. But it found time to add another item to its agenda -- stopping The Onion, the satirical newspaper, from using the presidential seal.

The newspaper regularly produces a parody of President Bush's weekly radio address on its Web site (www.theonion.com/content/node/40121), where it has a picture of President Bush and the official insignia.

"It has come to my attention that The Onion is using the presidential seal on its Web site," Grant M. Dixton, associate counsel to the president, wrote to The Onion on Sept. 28. (At the time, Mr. Dixton's office was also helping Mr. Bush find a Supreme Court nominee; days later his boss, Harriet E. Miers, was nominated.)

Citing the United States Code, Mr. Dixton wrote that the seal "is not to be used in connection with commercial ventures or products in any way that suggests presidential support or endorsement." Exceptions may be made, he noted, but The Onion had never applied for such an exception.