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
A look ahead at the forecast for the Border region.
Thousands of EU workers are employed by the region's tourism businesses - will Brexit be a good, or bad, thing for them... and the industry.
Kathleen Holme, 67, passed away after the blaze at her home on 26 March.