As part of his visit to Scotland, David Cameron is due to visit HMS Victorious, a Royal Navy submarine which keeps Trident nuclear missiles continuously at sea.
The Scottish National Party say they would scrap Trident in an independent Scotland.
However, Mr Cameron says it would be 'foolish' to abandon it because of the threat of nuclear attack from North Korea.
More top news
Emma Jesson brings you Sunday night's forecast
Frosty on Sunday night with showers on Monday, some wintry. Breezy in the west. Unsettled, changeable, cool new week
Emma Jesson brings you Saturday night's forecast