U.S. President-elect Donald Trump has appointed Lebanese American businessman Massad Boulos as a senior adviser on Arab and Middle Eastern affairs. Boulos, who is the father-in-law of Trump's daughter Tiffany, campaigned for Trump during the election to gain support from Lebanese and Arab Americans. He has contacts across Lebanon's political divide and has maintained relations with Hezbollah, a powerful political party in Lebanon. Boulos is well positioned to influence Trump's Middle East policy and played a significant role in expanding Trump's appeal to Arab American and Muslim voters during the campaign.