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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Responding for the first time to recent questions over the death of a steward, Walsh insisted the evidence said cabin air was safe.
The man identified as the Islamic State militant known as "Jihadi John" was a "popular" schoolboy who loved Manchester Utd and S Club 7.
Everton, the only British side left in the Europa League, have been handed a tough tie against Dynamo Kyiv in the last 16 round