Elton told Rolling Stone magazine that he could not believe it when Rush Limbaugh asked him to play his wedding.
''I thought it was a joke. I had dialogue with him before and he said, 'Im not anti-gay, I want you to come, bring David.' ''
Elton also mentioned that the radio show host was among the first to congratulate him on the birth of his surrogate son.
So he believes Limbaugh could be persuaded to come out in support of civil partnerships.
''If I rang him right now, I think he might agree,'' the singer said.
Elton also spoke about Keith Richards' memoirs.
He had been anticipating reading Life until hearing how Keith criticises Mick Jagger in it.
Elton declared that he'd never be so candid about his longtime songwriting partner, Bernie Taupin.
He said, "I was a bit put off by hearing the bit about Mick's penis. I'm a big Mick fan. If I said that Bernie was a miserable c**t and had a small penis, he'd probably never talk to me again.
"It's like, 'Why do that?' especially with someone you're in a working relationship with."
In addition, Elton fears the book will bring back too many bad memories for him.
He said, "It just sounds like it will take me back to the drug things."
The issue of the magazine, with Elton on the cover, will be available tomorrow.