The National Enquirer says it stands by its report that the mother of singer Engelbert Humperdinck's daughter fears he is "battling the AIDS virus."

The newspaper issued its statement Wednesday, a day after Humperdinck filed a $50 million-plus libel lawsuit against it, saying the story in this week's editions was false and malicious.

"The article, written and researched with extreme care, was based on court papers filed in New York's Family Court," the tabloid said from its Lantana, Fla., headquarters.

The lawsuit says the entertainer doesn't have and never had acquired immune deficiency syndrome and has never tested positive for the virus.