The Prime Minister has spoken repeatedly of his dream of a bridge or tunnel linking the province to the rest of the UK.
But speaking to reporters while in the United States, he said it would not be included in forthcoming plans to improve Britain's creaking infrastructure.
'Although it remains an ambition it is perhaps not the most immediate [priority]. It will be delivered substantially after the rest of the programme,' he said.
Plans for a tunnel to Northern Ireland have been shelved by Boris Johnson after Chancellor Rishi Sunak ruled it was too expensive
But speaking to reporters