The Supreme Court of Venezuela on Wednesday prohibited opposition leader Juan Guaidó from leaving the country. It has also frozen his Venezuelan bank accounts.

These precautionary measures were solicited by the Attorney General Tarek Saab, who hours previously announced criminal investigations against Guaidó.

Last week Guaidó declared himself acting president of Venezuela, despite Nicolás Maduro also claiming the presidency.

US President Donald Trump has endorsed Guaidó as the Interim President. John Bolton, Assistant to Trump on National Security Affairs, said on Twitter: “Let me reiterate. There will be serious consequences for those who attempt to subvert democracy and harm Guaidó.” In addition to threatening “serious consequences,” the US also issued sanctions against Venezuela’s state-owned oil company Petroleos de Venezuela with the intention to intensify pressure on Maduro to resign. According to a press release from the State Department in an effort to protect Venezuelan’s assets, the US allowed Guaidó “to receive and control certain property in accounts of the Government of Venezuela or Central Bank of Venezuela held by the Federal Reserve Bank of New York or any other U.S. insured banks, in accordance with Section 25B of the Federal Reserve Act.”

Recent unrest regarding results of the election has led to protester deaths and has drawn concern from the UN. The UN recognized and began investigating the humanitarian crisis last year.