He told BBC4 Radio that Hillary Clinton’s election would be “great for the entire world” and he would be “the happiest person on earth.”

Clinton said that the Bush administration “squandered” the support the United States got after the terrorist attacks of Sept. 11, 2001. He sees himself as a roving ambassador.

"I probably would be most useful to her doing something to try and restore America's standing in the world and build more allies and get us to work together again."

Clinton told The Guardian that large numbers of U.S. voters are concerned about the country’s image for the first time he has known.

The former president was in London to promote a new book, “Giving: How Each of Us Can Change the World,” and to attend a fundraiser for his wife’s campaign.