Donald John Trump is a real person, and was the 45th President of the United States. In the Grubiverse he is voiced by Ben, notably in the Slinky Boy sketch in Episode 8. In that same episode Trump was almost named Grub of the Week, but Eddo's apparent admission to cooking and eating kids meant that she was given that week's nomination instead. According to Episode S3E01 a US folk singer named Candica Solar sucked off Trump in 2018.
In Episode 99.7 a man named Gary Sweet (no relation to the actor) rang to do an impression of Trump in a alternate reality where he was Australian, was never President and had Irritable Bowel Syndrome.