United States (US) President Joe Biden, in his first letter to Prime Minister (PM) Shehbaz Sharif, reiterated the US’ unwavering commitment to standing alongside Pakistan in confronting the pressing challenges facing the world and the region. In his first communication with PM Shehbaz after assumption of his office, President Biden conveyed his heartfelt congratulations and best wishes to the newly elected government of Pakistan, a press release of Prime Minister Office said.