Democratic US Senator Chris Murphy said on Monday he wants a US national security review of a Saudi Arabian conglomerate’s stake in Twitter Inc after Elon Musk’s takeover of the social media company. Murphy said he was asking the Committee on Foreign Investment in theUnited States (CFIUS) — which reviews acquisitions of US businesses by foreign buyers — “to conduct an investigation into the national security implications of Saudi Arabia’s purchase of Twitter.” Most foreigners seeking to take even noncontrolling stakes in US companies must seek approval from CFIUS, a powerful Treasury-led commi…