- Former Secretary of State Rex Tillerson is set to testify this week in the ongoing trial of Tom Barrack, a billionaire investor who once served as a campaign adviser to former President Trump and is accused of illegally lobbying on behalf of the United Arab Emirates https://thehill.com/regulation/court-battles/3671169-tillerson-to-be-called-as-witness-in-trial-of-former-trump-advisor/ 4 comments law