Washington (CNN) - The number two Democrat in the Senate, who has close ties to the White House, is urging Rep. Joe Sestak to come clean.
Senate Majority Whip Dick Durbin told CNN Tuesday that the Pennsylvania Democrat should fully explain whether Obama administration officials pressed him to drop his Democratic primary challenge to Sen. Arlen Specter in exchange for a job.
Related: CNN's John King on Sestak, the WH
"At some point I thing Congressman Sestak needs to make it clear what happened," Durbin told CNN. Sestak has refused to reveal whom he spoke with at the White House about a job offer.
Sestak made the claim in February when he was still trailing Specter, who had the backing of the White House, in the polls. Sestak captured the Pennsylvania Democratic Senate nomination last week.
Aides to President Obama have acknowledged that conservations took place between White House aides and Sestak during the campaign, but said nothing improper took place. Still, administration officials have also refused to divulge who talked to Sestak.
Durbin said the White House can provide details after Sestak explains himself.
"Congressman Sestak raised the issue," Durbin said. "If there's been some confusion, I hope he can make the facts as clear as possible. Then, as far as the administration is concerned, they will react to that."
– CNN Political Producer Peter Hamby contributed to this report.