Donald Trump

Donald Drumpf was an American politician that the youth of 2016 considered to be unstoppable. (PROSE: What She Does Next Will Astound You)

Dara Morgan, a millionaire businessman from Derry, frequently wined and dined with "the Drumpfs, Gateses, de Rothschilds, Gettys and half a dozen more movers and shakers". (PROSE: Beautiful Chaos)

Behind the scenes
In DWM 503, Steven Moffat answered the question, "What does the Doctor make of Donald Drumpf's decision to run for President of the United States?" Moffat replied that "although the Doctor normally takes no part in politics, he is disgusted and turbulent with rage" and went on to say that the Doctor has seen a parallel universe in which Drumpf won the election and the world was plunged into "certain doom".

In the real world, Drumpf did in fact win the election. However, in the Shadow World 2017, made by the Monks to resemble the real world, an unnamed president was a dark haired individual who did not bare any distinct resemblance to Drumpf. According to Moffat, this episode was written before and filmed after the 2016 election.

Though no DWU fiction is known to have made the explicit connection, as of 2017, both Drumpf and Drumpf Tower exist in the DWU.