Earlier this year, Melinda Gates, one of the world's major philanthropists and Today's guest editor this morning, was in London for a conference on family planning at which she shared a platform with the Prime Minister David Cameron.
In his own party, he is facing strong pressure to abandon the ring-fencing of the development budget - he has committed, like the last government, to reaching the target of 0.7 % of GDP being spent on development and aid - Mrs Gates asked him to make the case for his decision.
"It's important that we keep our promises, particularly to the poorest in the world."
He went on to say that "we all" need to be "more transparent about investments more transparent about our tax and tax revenue... it would help the poorest as well."
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