John Oliver used his most recent "Last Week Tonight" episode to tear into presumptive republican presidential nominee Donald Trump over his steadfast refusal to release his tax returns.

The fearless British host feverishly sought to remind Trump that things have changed over the last 40-years after he appeared to justify his decision to hold all his financial information close to his chest by arguing, "Before 1976, most people didn't do it."

Countered Oliver, "Sure...but there were a lot of things we did before 1976 that seem crazy now, like smoking on airplanes and thinking Elliott Gould was a major sex symbol. The point is, times have changed."

Oliver Sees Trump, Republicans Party Coming Together

Besides also blasting Trump for allegedly creating a fictional publicist, Oliver took the entire Republican Party to task for its slow but surefire acceptance of one another.

With Trump recently coming to the decision that he will not be solely self-funding his campaign, the wide held assumption is he'll surely need the support of the GOP establishment to stay financially afloat.

He recently met face to face with majority House Speaker Paul Ryan, despite Ryan's previous insistence that he would never support the outspoken real estate mogul.

"Trump and the Republican establishment are like a teenage Christian couple who have made an abstinence pledge," said Oliver. "They are going to have sex-it's just a matter of time; but they need to make a big show of resisting it for anyone who might be paying attention."

Who is John Miller?

Finally, Oliver lambasted Trump over what many seem to believe was his fictional creation of a former publicist known as John Miller. In tapes from the 1990s recently made public, a voice that eerily sounds like Trump speaks with a "People" magazine reporter as John Miller.

When quizzed about where he came from, "John Miller" responds, "I worked for a couple of different firms, and I'm somebody that he knows, and I think somebody that he trusts and likes."

Oliver chalked it all up as vintage Trump. "Even his imaginary alter ego reflectively brags about himself!" he said.

Indeed, in the conversation Miller claimed that Madonna once called him about going on a date.

More recently, Trump insisted he knows nothing about the tape and that the voice is not his, all despite having admitted in the 90s that it was him.