On Sunday, President Donald Trump's lawyer, Rudy Giuliani, raised eyebrows around the world after claiming that "truth isn't truth" during an interview with NBC's Meet the Press host Chuck Todd.

Arguing that his client should not testify in special counsel Robert Mueller's Russia investigation as he could be "trapped in to perjury," Giuliani suggested that Trump's testimony wouldn't matter either way, since "truth isn't truth."

John Oliver asked on his Last Week Tonight show: "What is Giuliani doing and why does the White House keep letting him go on TV? Because at this rate, Trump is going to wind up behind bars with Giuliani visiting him and saying, 'Don't worry, Donald, prison isn't prison.'"

Calling Giuliani a “one-man legal improv troupe," Oliver said the attorney "came with a rationale for his boss's refusal to sit down with Mueller that is, even by Giuliani standards, very Giuliani."