Asked during a BBC Question Time special what sanctions people could face for declining to take part in the Conservative policy of compulsory national service for all 18-year-olds, the prime minister pointed to "driving licences, or the access to finance, all sorts of other things".
Questioned on whether this could mean denying young people bank cards, he replied: "There's lot of different models around Europe."
In his half-hour slot on the show, following Keir Starmer, Ed Davey and John Swinney, the Labour, Liberal Democrat and Scottish National party leaders, Sunak was repeatedly challenged on why the public should trust the Conservatives after 14 sometimes chaotic years in office.
He also received shouts of "shame" after refusing to say he would keep Britain in the European convention on human rights. He was also challenged on why on revelations about alleged betting on the general election date, which he said he was "incredibly angry" about.
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