Washington (CNN) Rudy Giuliani on Monday attempted to clarify his weekend remark that "truth isn't truth" as part of his explanation for why he doesn't believe that President Donald Trump should testify with special counsel Robert Mueller.

"My statement was not meant as a pontification on moral theology but one referring to the situation where two people make precisely contradictory statements, the classic 'he said,she said' puzzle. Sometimes further inquiry can reveal the truth other times it doesn't," tweeted Giuliani, a lawyer for Trump in the Russia investigation.

My statement was not meant as a pontification on moral theology but one referring to the situation where two people make precisely contradictory statements, the classic "he said,she said" puzzle. Sometimes further inquiry can reveal the truth other times it doesn't. — Rudy Giuliani (@RudyGiuliani) August 20, 2018

Giuliani's tweet came less than 24 hours after he sparred with NBC's "Meet the Press" anchor Chuck Todd over the meaning of "truth."

"When you tell me that, you know, he should testify because he's going to tell the truth and he shouldn't worry, well, that's so silly because it's somebody's version of the truth. Not the truth," Giuliani said Sunday.

"Truth is truth," Todd replied.

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