It's plainly wrong for a member of Congress to collaborate with a public relations firm to produce knowingly deceptive testimony on an important issue. Yet Representative Tom Lantos of California has been caught doing exactly that. His behavior warrants a searching inquiry by the House Ethics Committee.

Mr. Lantos is co-chairman of the Congressional Human Rights Caucus. An article last week on The Times's Op-Ed page by John MacArthur, the publisher of Harper's magazine, revealed the identity of a 15-year-old Kuwaiti girl who told the caucus that Iraqi soldiers had removed scores of babies from incubators and left them to die.

The girl, whose testimony helped build support for the Persian Gulf war, was identified only as "Nayirah," supposedly to protect family members still in Kuwait. Another piece of information was also withheld: that she is not just some Kuwaiti but the daughter of the Kuwaiti Ambassador to the U.S.

Saddam Hussein committed plenty of atrocities, but not, apparently, this one. The teen-ager's accusation, at first verified by Amnesty International, was later refuted by that group as well as by other independent human rights monitors. But the issue is not so much the accuracy of the testimony as the identity and undisclosed bias of the witness.