Leading members of the opposition Social Democratic Party (SDE) think that Jüri Ratas (Center) resignation as prime minister early Wednesday morning should be followed by his party going into opposition, since the latest scandal involving a loan to a real estate development proves the party still needs to clean itself up. MEP Sven Mikser (SDE) says that Reform Party leader Kaja Kallas holds the key to this, with SDE's leader Indrek Saar saying Center continuing in office would be unethical. Ratas resigned early Wednesday following an Internal Security Service (ISS) investigation into a €39-million loan to a Tallinn real estate development by state credit agency KredEx. Five people, including Center's former Secretary-General Mihhail Korb, are under suspicion of corruption.