Deputy Prime Minister Nick Clegg will deliver a speech today on immigration, proposing a bail-like system of security bonds, aimed at targeting visa "overstayers".
Speaking to Daybreak, members of the public said Britain was "too lenient on immigration".
One man said: "How is it controlled? It's not is it, so it should be controlled a lot better."
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In Edinburgh tonight you can hear it and feel it. The buzz, the banter of the day and the thrilling sense something big is coming tomorrow.
There is nervousness, anxiety and on the streets of Edinburgh fuelled by an atmosphere unlike anything seen before in recent UK politics.
How will the vote go? What would a Yes victory do to England? Policital Editor Tom Bradby answers readers' questions on the referendum.