Speaking to reporters here, Bush said, "We are still very nervous after 9/11."
Bush was speaking at an award event organised by a newspaper company.
Bush also pointed out reasons for listing Nigeria as a country of interest after the failed bombing plot by Umar Farouk Abdulmutallab on Christmas day.
He said the US Congress is very concerned about such matters.
Former British Prime Minister Tony Blair was also present at the event.
He said, "The best way to conquer terrorism was to show that people of different faiths could live together and that people should not disrespect each others religions."