The ceremony in Dubai, home to the world’s tallest building and other architectural marvels, marks the first major event abroad that the two Trump sons will attend together since their father’s inauguration Jan. 20.

Ties between the Trumps and Sajwani remain strong. One of the Trump Organization’s subsidiaries received from $1 million to $5 million from DAMAC for running the golf club, according to a U.S. Federal Election Committee report submitted in May.

Sajwani and his family also attended a New Year’s Eve celebration at Trump’s Mar-a-Lago club in Florida, where Trump referred to them as “the most beautiful people from Dubai.”

Trump days later told journalists that DAMAC had offered the Trump Organization $2 billion in deals after his election, something DAMAC later confirmed.

The Dubai golf course marks Trump’s first successful venture in the Arab world. Another Trump-managed golf course is planned for another even larger DAMAC project under development and the developer has been putting up billboards around Dubai advertising the newly opened course.

The 18-hole course has raised questions about how the Trump Organization’s many international business interests will affect the administration of America’s 45th president.

Already, a liberal-funded watchdog group has filed a lawsuit alleging his business violates the so-called emolument act of the U.S. Constitution. Similar questions have been raised by legal experts over Trump’s Dubai course.

Trips abroad by Trump’s two sons are expected to continue. Before Trump’s inauguration, his son Eric visited the Trump Tower Punta del Este in Uruguay to check on the tower’s progress and personally greet buyers. A Trump hotel in Vancouver, British Columbia, is also expected to soon host Trump’s sons.