A former president of the Marshall Islands has called for an investigation into an alleged plot by a Chinese couple to establish a mini-state inside its borders and set it up as a lucrative tax-break haven. The pair were charged by US prosecutors with bribery and money-laundering offences over a “multi-year scheme” that included establishing a non-governmental organisation, allegedly bribing five Republic of the Marshall Islands (RMI) officials and attempting to bribe a sixth. One of the five was allegedly given cash to bribe others into supporting the carving out…