Members of the House of Lords have called on the government to reconsider awarding a contract to print new blue UK passports to a Franco-Dutch firm.
Conservative peer Lord Naseby said it would have a major adverse effect on "the whole of British industry, and the British people as they face Brexit".
The burgundy passport, in use since 1988, will revert to its original blue and gold colour from October 2019.
Gemalto has won the contract ahead of the current UK producer De La Rue.
Lord Naseby said that he wanted an assurance that "nothing will be signed or sealed until the whole matter's been reviewed".