Ted Haggard, who stepped down from the presidency of the 30 million-member National Association of Evangelicals yesterday, told KUSA television in Colorado that he had bought methamphetamine from Mike Jones but that he had not used it.
"I called him to buy some meth but I threw it away," said Mr Haggard, who denies having sex with Mr Jones. "I was buying it for me, but I never used it."
Mr Haggard's admission came as it emerged that his accuser had failed parts of a lie-detector test carried out by KHOW local radio station.
The test administrator found indicators of "deceptions" in some of Jones' answers but cautioned that they may have been caused by the stress of the scandal, which dominated US news bulletins.
Mr Haggard has close links to the White House and was described in 2005 as being one of the 25 most influential evangelicals in America by Time Magazine.
The 50 year old married father-of-five was asked if he had had sex with Mr Jones and replied, "No, I did not."
Mr Jones meanwhile stood by his claims in a radio interview, suggesting he could have fabricated more explosive allegations if he was lying.
"I have said everything that has happened is the truth," Jones said.
"If I wanted to make up some additional story, I could embellish many more things. I could talk about kinky sex or something."
Mr Haggard said he had been referred to Mr Jones by staff at a Denver hotel. He acknowledged seeing the escort for a massage, who then told him he could get methamphetamine which he later supplied.