Tony Blair believes the way forward for Britain is to seek guidance from Emmanuel Macron. The former British prime minister has a reputation for outlandish claims but the suggestion that the United Kingdom can benefit from pearls of wisdom proffered by the most divisive president in the history of the Fifth Republic is baffling even by Blair’s standards.

According to Politico, Blair will host a Future of Britain conference on June 30, which is a collaboration between his eponymous Institute and the Britain Project, a centrist think tank that was established in the wake of the 2019 general election and which...