Donald Trump

In 2017, a president had recently been elected. Bill Potts said she would have never have voted for him as he was "orange". (TV: The Pyramid at the End of the World)

Behind the scenes
This president's real world counterpart is Donald Trump, although the connection has never been made in-universe.

In the previous episode, set in a reality created by the Monks to resemble the real world almost perfectly, an unnamed president was a dark haired individual who did not have much physical resemblance to Trump. Trump’s status as president was confirmed in Arachnids in the UK.