Our Scotland Political Editor Peter MacMahon spoke to the Prime Minister during his visit to the Scottish Conservative Conference.
Watch the full interview on independence - and how it could affect the border - here:
David Cameron has been speaking to ITV Border's Scotland Political Editor Peter MacMahon at the Scottish Conservative Party conference.
When asked whether there would be border controls between Scotland and England this was Mr Cameron's response.
David Cameron has said his promise to make devolution work better for Scotland is not a consolation prize for Alex Salmond if the nation votes to stay as part of the UK.
Mr Cameron was addressing his Scottish party members at the Edinburgh International Conference Centre.
David Cameron addresses Scottish Conservative Party conference in Edinburgh
David Cameron told the Scottish Conservative Party conference in Edinburgh that a 'no vote' can mean further devolution and more power to the Scottish people.
David Cameron has told the Scottish Conservative Party conference in Edinburgh there will be 'no going back' if Scotland vote yes for independence.
David Cameron has condemned Scottish nationalists as "wrong and irresponsible" for dismissing warnings about the political consequences of the upcoming referendum as a "south of the border conspiracy".
Addressing the Scottish Conservative party conference, the Prime Minister said the warnings about an independent Scotland's currency and place in Europe were necessary with citizens ready to make a "major life changing decision".
Speaking at the opening of of the Scottish Conservative party's spring conference in Edinburgh, the prime minister is expected to say the referendum is "a major life decision" that shouldn't be made without knowing the full consequences.
He is expected to add:
David Cameron will focus on his fight to keep Scotland in the UK as he opens the Scottish Conservative party conference later today.
He is due in Edinburgh, where he will draw on recent interventions from major businesses, such as BP and Shell, in the referendum debate.
Mr Cameron will attempt to tackle accusations of "scaremongering" over the country's future, saying he wants to "take that myth apart".