"Last Week Tonight" host John Oliver is mocking President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's personal attorney Rudy Giuliani's "truth isn't truth" comment, saying the president's lawyer will soon be telling Trump, "Don’t worry, Donald, prison isn’t prison."

"What is Giuliani doing?" Oliver asked on his show Sunday night after playing the widely circulated clip of Giuliani on NBC's "Meet the Press" earlier in the day.

"Why does the White House keep letting him go on TV?" Oliver asked. "At this rate, Trump is going to end up behind bars with Giuliani visiting him and saying, 'Don’t worry, Donald, prison isn’t prison.' "

Giuliani was broadly criticized over his assertion that "truth isn't truth" during the NBC interview, referring to his belief that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE will draw Trump into a "perjury trap" if the two sit down for an interview.

WATCH: Rudy Giuliani tells @chucktodd that he doesn’t want President Trump to be caught in a perjury trap by speaking with Special Counsel Robert Mueller. #MTP #IfItsSunday



Giuliani: “Truth isn’t truth" pic.twitter.com/SChZbfgAOX — Meet the Press (@MeetThePress) August 19, 2018

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"I’m not going to be rushed into having him testify so he gets trapped into perjury," Giuliani said Sunday. "And when you tell me that he should testify because he’s going to tell the truth and he shouldn’t worry, well that’s so silly because that’s somebody’s version of the truth, not the truth."

"Truth is truth,” host Chuck Todd replied.

"No it isn’t," Giuliani said. "Truth isn’t truth."

Oliver during the bit on Sunday referred to Giuliani as a "one-man legal improv troupe" and called his recent comments "very Giuliani ... even by Giuliani's standards."

"That is not acceptable from a president’s lawyer," Oliver said. "It’s barely acceptable from a sophomore philosophy major who just tried Molly for the first time."

Oliver also criticized Giuliani for openly admitting during the interview that the Trump Tower meeting was "originally for the purpose of getting information about [Democratic presidential nominee Hillary] Clinton."