President Trump is headed to Europe Tuesday to meet with European leaders at the NATO summit in Brussels. In advance of the summit, Trump reportedly sent sharply worded letters to the leaders of Germany, Belgium, Norway, Canada and other NATO allies, complaining that they are spending too little money on military expenses. This week’s summit comes after Trump lashed out at European allies during the G7 summit in Quebec last month. After his trip to Brussels, Trump is expected to visit London, where widespread protests are planned against his visit. He’s then set to travel to his private golf course in Scotland—the Trump Turnberry in Ayrshire—and then fly to Helsinki for his summit with Russian President Vladimir Putin on July 16.