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 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.

Panama Ports Co., the entity run by Hutchison Port Holdings, didn’t receive required approvals from the comptroller’s office for a contract extension in 2021 and also used a series of tax-exempt subcontractors to lower the amount it pays to the government, Comptroller General Anel Flores told reporters April 7 following an audit.