The US Justice Department says it has filed 40 new petitions to revoke the citizenship of naturalised Americans accused of crimes such as money laundering, child sexual abuse, visa fraud and espionage for China, calling it the largest denaturalisation effort in modern history. Prosecutors argue the individuals concealed facts when applying and so lacked the required "good moral character". Denaturalisation has long been reserved for grave offences, and human rights groups warn the Trump administration's expansion could render people stateless and be turned against political opponents.