8 May 2016 Last updated at 13:37 BST
But he told the BBC's Andrew Marr show that the UK should be driven by its own national interest and what is a "win-win" for it - notably control over its borders, the ability to decide how it spends its money and "greater democratic control".
The European "establishment" wants the UK to remain in the EU, Justice Secretary Michael Gove has claimed, because it is in their interest to do so given the current balance of trade.