Police are right to look again at whether former minister Denis MacShane's abuse of expenses broke the law, the shadow home secretary says.
Yvette Cooper said the MP's case should be re-examined in the light of "very severe condemnation" by parliament's sleaze watchdog.
The comments came after the Commons authorities insisted that damning letters from Mr MacShane to the standards commissioner could not be used against him in court.
Senior officials say they are protected by parliamentary privilege because they were collected during proceedings of the House.
Interviewed on the BBC's Andrew Marr Show, Ms Cooper said the Standards and Privileges Committee had produced a "very serious report with very serious condemnation".
"I think it is right that the police should be looking again at this," she said.
"They have said they are doing that. They have to make their decision independently, the Crown Prosecution Service have to make their decisions independently."
Ex-Labour frontbencher Mr MacShane announced he was resigning as an MP on Friday after the committee recommended a year's suspension from the Commons for claiming thousands of pounds using fake receipts.