President Barack Obama is heading out on a weeklong trip next week that will take him to Saudi Arabia, England and Germany. In Saudi Arabia, Obama plans to meet with King Salman. He'll also attend a summit with the leaders of six Arabian Gulf countries to discuss efforts to counter ISIS, following up on a similar meeting Obama hosted last year. In England, Obama will have lunch with Queen Elizabeth II at Windsor Castle to celebrate her 90th birthday. He'll also meet with Prime Minister David Cameron. In Germany, Obama's final stop, the president plans talks with Chancellor Angela Merkel. He'll also join her to open the Hannover Messe, one of the world's largest industrial technology trade fairs.