The Prime Minister was making the business case for Scotland remaining in the United Kingdom today at a business dinner in Glasgow.
Speaking just three weeks before Scots go to the polls, he said the UK was the "greatest merger in history" and one of the "oldest and most successful single markets in the world."
But as ITV News Correspondent Martin Geissler reports, not everyone is convinced:
With just a few weeks to go until the Scottish independence referendum takes place, here are some key facts about the vote.
An investigation has been launched after listings appeared on eBay offering to sell votes in the upcoming Scottish independence referendum.
Bounce for leaving the union following second debate this week, but only 43% expected to vote yes in referendum on September 18