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
The latest round of polls from Lord Ashcroft show the Scottish National Party has experienced a surge in 'no' as well as 'yes' voting areas.
The latest polling from Lord Ashcroft suggests the SNP is pushing the Unionist parties hard in our region.
A look ahead at the forecast for the Border region.