Former Labour minister Denis MacShane has admitted false accounting by putting in fake receipts for £12,900 of "research and translation" services at the Old Bailey.
He used the money to fund trips to Europe, including to judge a literary competition in Paris.
Asked to enter a plea to the charge in a hearing at the Old Bailey, MacShane replied: "Guilty."
Mr Justice Sweeney told the former MP, that "all sentencing options remain open".
More top news
Danish submarine inventor Peter Madsen has been sentenced to life in prison for torturing and murdering Swedish reporter Kim Wall.
A BBC chief said reporters also had a responsibility to be sensitive in their broadcasts.
Ruth Smeeth is due to give evidence at a hearing involving party member Marc Wadsworth.