David Cameron insists that despite concerns from other members of his party "now is not the right time to leave Britain".
When questioned on the BBC's Andrew Marr Show, the Prime Minister said that "fifty percent of Britain's trade currently happens with Europe" and so it was very important that "Britain retains it's seat at the table".
Mr Cameron said that despite Britain's trade agreements, as long as he stayed Prime Minister the country would not convert its currency to the Euro.
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His mother Princess Diana was killed in a car crash in Paris in 1997 when he was just 12 and his brother William was 15.
The 21-year-old, who was arrested on Sunday, also allegedly injured two other people in the attack in the German city of Reutlingen.
She was going to the aid of a family member who got out of the car in the middle of the park and was dragged away by a different tiger.