Earlier in the day, Rishi Sunak was confirmed as the new Tory leader, making him the UK s next prime minister. Rishi Sunak is all set to take over former UK PM Liz Truss, who resigned after being in office for 44 days. 📰 Rishi Sunak, United Kingdom’s PM-Designate Receives Thunderous Applause After He Arrives at Conservative Party Headquarters (Video).