South Korea's constitutional court has given the go ahead to a special counsel to probe into fraud allegations against Lee Myung-bak, the country's president-elect. The ruling on Thursday came as Lee prepared for his inauguration on February 25, after which he will have immunity from prosecution. In late December the outgoing government approved a plan to open an investigation into the alleged fraud but Lee's relatives sought a judicial review on the constitutionality of the investigation process. The former Seoul mayor and business tycoon secured a landslide victory in last month's presidential election and promised to revive the country's economy. Lee is the first South Korean president-elect to face a criminal investigation.