Former Prime Minister Tony Blair said that while there were "perfectly legitimate" debate about the role of the US/UK invasion of Iraq to topple Saddam in 2003, it was important to look at the events in Iraq in relation to the war in Syria.
Speaking in a pre-recorded interview on BBC1's Andrew Marr show, he said the single biggest worry for security forces in the UK and across Europe was the threat of returning jihadist fighters from Syria.
More top news
In the unexpected announcement on Monday, Mr Key said it was the "right time" to leave politics.
As the Government's Brexit appeal comes to the Supreme Court, here's a look at what you need to know.
According to local reports, the man was found by friends in their accommodation in Val Thorens resort in the Alps on Sunday morning.