Donald Trump signed an executive order on Monday ordering the US treasury and commerce departments to create a sovereign wealth fund and said it may also be used to purchase the social media platform TikTok. TikTok, which has about 170 million American users, was briefly taken offline just before a law requiring its Chinese owner, ByteDance, to either sell it on national security grounds or face a ban that took effect on 19 January. Trump, after taking office on 20 January, signed an executive order seeking to delay by 75 days the enforcement of the law. The US president has…