07/08/2003 at 01:00 AM EDT
Beyoncé Knowles is drawing fire for what some are calling her improper appearance during a nationally televised NBC performance on the July 4, reports New York's Daily News.
Her gig, in which the star was skimpily dressed, took place in upper Manhattan at the tomb of the 18th President, Ulysses S. Grant.
On Monday, the News reports, the Grant Memorial Association termed her behavior "inappropriate," with the head of the organization, Frank Scaturro, threatening to alert the National Park Service, asking that any future entertainment at the site show more dignity.
"I am glad there is more appreciation of this memorial than there once was," said Scaturro. "But this particular memorial also happens to be the man's tomb. ... This is something I think people should take into consideration."
While other concerts have taken place at Grant's Tomb, Scaturro told the News that Beyoncé, 21, "clearly crossed the line" of appropriateness.
"Actually, I didn't think Bon Jovi was appropriate, either," Scaturro added. "I don't think any kind of rock music or popular music of today is exactly in keeping with the nature of the site."
Though there has been no comment from Beyoncé's camp on the issue, President Grant's great-grandsons Ulysses Grant Dietz, 47, and Chapman Foster Grant, 58, have spoken up on Beyoncé's behalf.
"The way the world is now, who cares?" said Chapman Grant, noting that it's good that the site is getting publicity.
As for the concert, he added: "Who knows? If the old guy were alive, he might have enjoyed it."