Ballard Partners is representing Bassem Awadallah, the US citizen and former advisor to Jordan's royal court and Saudi crown prince, who was sentenced to 15 years in prison in July for working to plot against Jordan's monarchy.
Awadallah was Jordan's envoy to Saudi Arabia and later became an economic advisor to crown prince Mohammed bin Salman.
After his arrest, the head of Saudi intelligence rushed to Jordan to press for his release.
The lawyer for Awadallah, who also is a citizen of Jordan and Saudi Arabia, claims that he was beaten and tortured in person and held in solitary confinement.
Ballard represents Awadallah as a subcontractor to Ashcroft Law Firm, which was established by former attorney general John Ashcroft.
Brian Ballard, who was Donald Trump's chief fundraiser in Florida, heads his firm's Awadallah team that includes senior partners Syl Lukis and Gerald John O'Hanlon.