"On this occasion a member of our staff did discuss a possible question about Senator Clinton's energy plan at a forum,” Elliethee said.

“However, Senator Clinton did not know which questioners she was calling on during the event. This is not standard policy and will not be repeated again.”

The campaign's admission that it planted the question may be another blow to the New York senator's image as a trustworthy politician.

For the second time in as many days, Hillary Clinton's presidential campaign has had to deal with accusations of planting questions during public appearances.

In a telephone interview Saturday with Fox News, Geoffrey Mitchell, 32, said he was approached by Clinton campaign worker Chris Hayler to ask a question about how she was standing up to President Bush on the question on funding the Iraq war and a troop withdrawal timeline.

The encounter happened before an event hosted by Iowa State Sen. Gene Frais on a farm outside Fort Madison, Iowa.

Clinton's Iowa campaign confirmed to Fox News that one of its staff discussed questions with Mitchell before her April 2 event, but denied attempting to plant a pro-Clinton question.