Pakistan Foreign Minister Bilawal Bhutto Zardari says Islamabad will issue a demarche with U.S Ambassador hours after U.S President Joe Biden called the country among the 'most dangerous' in the world. Biden had raised concerns about the country's 'nuclear weapons without any cohesion', a statement that drew sharp criticism from Pakistan leaders. 'We know how to safeguard our nuclear arsenal,' Geo News quoted Bilawal Bhutto saying.