rome italy anti-establishment 5-star movement tell french president emmanuel macron thursday represent threat european union seek shrug label populist leader luigi di maio whose party top poll ahead national election due early next year write open letter macron french leader reportedly express concern anti-system force italy sure get know good realize movement threat cultivate best solutions many europe problems di maio say letter publish 5-star movement blog italian media report week macron tell former italian prime minister matteo renzi worry rise 5-star northern league close france national front ally britain unite kingdom independence party european parliament 5-star try distance anti-immigrant eurosceptic party rest bloc di maio sober 31 year-old take leadership movement found comedian beppe grillo say 5-star share macron desire rebuild europe lazily call us populist without know mean reality ... close people want pay-back role change country say di maio make mention referendum italy use euro 5-star originally pledge burst onto political scene 2013 since back away regard eu budget rule di maio say 5-star point view close france say let budget deficit rise accommodate spend welfare investments january 5-star european parliamentarians try fail split ukip successfully campaign britain leave eu 5-star eventually give lead role group italy 's 5-star tell france 's macron movement threat eu