David Cameron said he would give London Mayor Boris Johnson "a warm welcome" if he decides to return to Parliament.
The Prime Minister told ITV News' deputy political editor Chris Ship: "I think he's got a huge contribution to make.
"Whenever Boris wants to, he'll get a warm welcome from me".
More top news
It will be a dull and damp day today, with heavier and more persistent rain to the northwest and across Wales.
Royal Mail privatisation report reaches a surprising conclusion - and it's good for the Government
Public libraries face "absolute disaster" and should take inspiration from coffee shops to avoid large-scale closures, a report has claimed.