Samantha Cameron visited Syrian refugees in Lebanon in March and is cited as the "biggest explanation" for the Prime Minister's stance over the conflict.
Sources close to Mr Cameron confirmed to the paper that his wife had pushed for a more robust response to the humanitarian crisis.
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The record-breaking figure includes 440,000 supplies given to children in the past year.
The soldiers who trained there left their names and messages on the walls of the tunnels.
Researchers were shocked to find the so-called Sussex Declaration hidden away in a record office.