"I thought it right to hold the referendum because this issue had been poisoning British politics for years. The referendum had been promised and not held," he said during a visit to Ukraine.
"I made a promise to hold a referendum, I think it was the right thing to do," said the Conservative ex-premier, who called the referendum.
On June 23, 2016, 17.4 million Britons voted to end their 43-year-old membership of EU.
"But it was a decisive result and that's why today Theresa May quite rightly is taking the next step to ensuring the people's will is followed through," he added.
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Today, Cameron's successor May launched the process to leave the EU, formally notifying the bloc via a letter to EU President Donald Tusk.
"I hope we will be out of the European Union, but we will take part in security cooperation and other forms of cooperation to recognise that while we are leaving the European Union, we are not leaving Europe, we are not giving up on European values," Cameron said.
"We were in the EU for reasons of utility rather than emotion. We were there for the trade, we were there for the cooperation and I thought it right to stay because I wanted more trade and more cooperation."
"But nonetheless the other side... Won a vote and we need to go ahead with Brexit.
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