After helping negotiate peace in Northern Ireland, the former prime minister’s reputation was tarnished by his role in the U.S.-led invasion of Iraq. Is he stepping into another diplomatic quagmire?

LONDON: Tony Blair, Britain’s former prime minister whose legacy was heavily tarnished by the 2003 war in Iraq, has long been a contentious figure in the Middle East and beyond.…

After helping negotiate peace in Northern Ireland, the former prime minister’s reputation was tarnished by his role in the U.S.-led invasion of Iraq. Is he stepping into another…