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.

A deal to transfer control over major Panama ports from China-tied CK Hutchison to American firm BlackRock hit roadblocks after Panama’s top auditor accused the Hong Kong business of wrongdoings and owing hundreds of millions of dollars in unpaid fees.

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