The country’s top auditor said CK Hutchison owes the government $300 million, posing a hurdle to a plan touted by Trump to bring the ports under U.S. control.

The transaction has drawn fierce criticism from influential Chinese political offices, including the mainland’s Liaison Office.

BlackRock could hit another roadblock in its attempt to secure control of two flagship ports near the Panama Canal once the Central American country releases an audit on a 25-year concession granted to Hong Kong-based CK Hutchison .