U2 star Bono rarely fears meeting world leaders because he prepares for the encounters by reminding himself he represents the world's poor.

The Irish humanitarian insists he never feels intimated meeting presidents and prime ministers - because he always has right on his side.

He explains, "I have no fear of politicians... They should be afraid, because they will be held accountable for what happened on their watch.

"I'm representing the poorest and the most vulnerable people. On a spiritual level, I have that with me.

"I'm throwing a punch and the fist belongs to people who can't be in the room, whose rage, whose anger, whose hurt I represent. The moral force is way beyond mine, it's an argument that has much more weight than I have. So I'm not feeling nervous."