President Donald Trump used his White House Twitter perch on Saturday to link to a commercial for his golf resorts in Scotland and Ireland.

The post was the latest example of what ethics experts have complained is Trump’s manipulation of his powerful office to enrich himself and his family. His businesses can also serve as a conduit for money to Trump from those currying favor with him, violating the Constitution’s Emoluments Clause. The clause prohibits federal officials from accepting gifts or payments from foreign governments and officials. Unlike other presidents, Trump has refused to divest from his businesses.

The president retweeted to his 62 million Twitter followers a post from the Trump Organization about what it termed the “Trump Triangle” — golf courses in Turnberry and Aberdeenshire in Scotland, and in Doonbeg, Ireland, where he traveled in June after a state visit to London. Trump reportedly had insisted that Ireland’s prime minister meet with him at his golf course, but the Irish leader refused such an arrangement as “unseemly,” according to a representative. The men met instead at a Shannon Airport lounge.

The plug retweeted by Trump hails his businesses as “three of the most spectacular courses in the world @TrumpGolf.” The tweet adds: “Tune into @GolfChannel next week during @TheOpen to catch our latest commercial.” The post linked to a 30-second commercial for the courses. A narrator invites viewers to “visit Trumpgolf.com today to book your ultimate links tour.”