WASHINGTON (CNN) - Lance Armstrong, the seven-time Tour de France winner and cancer survivor, called on the presidential candidates to participate in a forum to discuss a national strategy on fighting cancer in a video posted on his foundation's Web site Thursday.
"I think whoever wants to be commander in chief ought to answer the cancer question," Armstrong said in the video. He referred to cancer as "the No. 1 killer in this country" and said it should be talked about "just like they would discuss war or terror or taxes."
Sean Mossman, a spokesman for Armstrong's charity LIVESTRONG, said that Armstrong personally called the candidates and asked them to participate in the forums.
The Democratic forum is scheduled for August 27 and the Republicans are set for the following day, both in Cedar Rapids, Iowa. So far, Democratic candidates New Mexico Gov. Bill Richardson and former North Carolina Sen. John Edwards have committed to participating. Edwards' wife is currently suffering from an incurable type of cancer. On the Republican side, former Arkansas Gov. Mike Huckabee, former Wisconsin Gov. Tommy Thompson and Kansas Sen. Sam Brownback have all committed.
Mossman said he is in "positive negotiations" with the rest of the candidates and he thinks more of them will commit soon.
"The concept is appealing to them and they understand the need for this type of forum," Mossman said. "They appreciate that someone is taking the lead on that."
- CNN Associate Producer Lauren Kornreich