Friday, August 14, 1998 Published at 21:11 GMT 22:11 UK
Clinton 'could admit sexual encounter'
President Clinton: insisted he did not have 'sexual relations'
The report, in the New York Times, comes as Mr Clinton prepares to testify before a grand jury on Monday.
It is believed that the president may acknowledge having sexual contact with Miss Lewinsky. based on a narrow definition of sexual relations.
The newspaper said the president would still maintain he was truthful in saying he had no "sexual relations" with her.
The White House has refused to comment on the report.
Mr Clinton has said that he will testify completely and truthfully to the grand jury.
According to the report Mr Clinton is considering saying that he based his earlier sworn denial on a definition of sex approved by the judge in the earlier Paula Jones sexual harassment lawsuit.
In the Jones case, US District Judge Susan Webber Wright ruled that "for the purposes of this deposition, a person engages in 'sexual relations' when the person knowingly engages in or causes contact with the genitalia, anus, groin, breast, inner thigh, or buttocks of any person with an intent to arouse or gratify the sexual desire of any person."
The Times said Mr Clinton's advisers believe this definition does not cover certain activities, including oral sex.