Donald Trump Cabinet | US President-elect Donald Trump has appointed Massad Boulos, a Lebanese-born billionaire, as his senior adviser for Arab and Middle Eastern Affairs. Boulos is also the father-in-law of Trump's daughter Tiffany Trump. The President-elect made the announcement on Truth Social, highlighting Boulos's legal and business expertise. "I am proud to announce that Massad Boulos will serve as Senior Advisor to the President on Arab and Middle Eastern affairs," Trump posted on Truth Social of the appointment, which puts his daughter Tiffany's father-in-law in a major White House position.