WASHINGTON: An individual using an artificially generated voice to impersonate Secretary of State Marco Rubio contacted three foreign ministers and two US officials last month, pretending to be the top US diplomat, according to a diplomatic cable seen by Reuters on Tuesday. In mid-June, the person contacted the ministers, a US governor and a member of Congress via the Signal messaging app and left voicemails for at least two of them, the cable said. In one instance, a text message was sent to