Forty-five American lawmakers have urged the US government to boycott next month’s G20 summit in Riyadh unless Saudi authorities address key human rights concerns, according to correspondence released Wednesday. The letter from US Congress members to Secretary of State Mike Pompeo comes after European lawmakers passed a resolution this month calling for the European Union to downgrade its attendance at the summit, also over human rights. The developments are a source of embarrassment for the kingdom, the current G20 president, as it gears up to host world leaders next month at what is widely seen as a crucial event for Saudi international diplomacy. Among a suite of demands, Congress members called on Riyadh to release jailed activists including several women, end its military campaign in neighbouring Yemen and provide accountability for the 2018 murder of journalist Jamal Khashoggi in Istanbul.