Watch John Oliver Reluctantly Talk 'Donald Drumpf' on 'Colbert'

'Last Week Tonight' host discusses his Trump rebranding campaign, compares Republican candidate to British monarchs

John Oliver returned to 'The Late Show' Monday to discuss 'Donald Drumpf' and compare the Republican frontrunner to past British kings

John Oliver returned to The Late Show With Stephen Colbert Monday and spoke about the one thing he was sure he would never have to care about the last time he appeared on the show: Donald Trump.

Seven months later, the beleaguered Last Week Tonight host hashed out Trump's continued ascendency and recounted the segment on his HBO show, which sought to take some luster out of Republican frontrunner's famous name by replacing it with his ancestors' original German name, Drumpf.

Last Week Tonight even made a slew of knock-off "Make America Great Again" hats that read "Make Donald Drumpf Again," and sold about 35,000 of them (at cost, much to the hilarious dismay of HBO). Oliver even said that Jay Z's people called the network and asked for a free cap, to which Oliver deadpanned, "Buy a hat, spring for a hat. Let it trickle down. That's how economics work."

Colbert closed by asking Oliver if a candidate like Trump could ever be successful in England, or if the country's parliamentary system would naturally weed them out. "It's not that it could happen, it has happened," Oliver replied. "We had many kings in the past. There's an equivalent love for gold between 18th century kings and current presidential candidates."

Watch late-night hosts call out Donald Trump's supporters.