Rob Jetten was sworn in Monday as the Netherlands’ youngest-ever prime minister and the first openly gay leader to hold the office, capping a snap election season that reordered Dutch politics and sidelined far-right firebrand Geert Wilders. The 38-year-old centrist and his cabinet took the oath before King Willem-Alexander at Huis Ten Bosch in The Hague, ushering in a new government formed by Jetten’s D66 with the center-right CDA and liberal VVD. The coalition holds 66 seats—nine short of a majority—forcing Jetten to seek…