In 2015, Speaker of the House John Boehner and Senate majority leader Mitch McConnell invited Israeli prime minister Benjamin Netanyahu to address a joint session of Congress without notifying the Obama administration. This defiance of protocol led Biden and more than 50 congressional Democrats to skip Netanyahu's speech. In August 2016, Biden visited Serbia, where he met with Serbian president Aleksandar Vučić and expressed his condolences for civilian victims of the bombing campaign during the Kosovo War. In Kosovo, he attended a ceremony renaming a highway after his son Beau, in honor of Beau's service to Kosovo in training its judges and prosecutors.