(CNN) On Tuesday we learned that the rough transcript released by the White House of the July 25 call between President Donald Trump and his Ukrainian counterpart Volodymyr Zelensky was something short of complete. That's according to Alexander Vindman, a Ukraine expert on the National Security Council, who told House investigators that he sought, unsuccessfully, to include Trump mentioning to Zelensky that tapes existed of Joe Biden.

Which is verrrrrry interesting -- primarily because Trump himself has repeatedly insisted that the transcript released by his White House was absolutely exact.

Twice in a press conference earlier this month, Trump went out of his way to say the rough transcript was, in fact, a verbatim recounting of his call with Zelensky. "I had a transcript done by very, very talented people -- word for word, comma for comma," said Trump at one point in that early October news conference. "Done by people that do it for a living. We had an exact transcript." Later, he added that the document was "an exact transcript of my call, done by very talented people that do this -- exact, word for word."

Trump echoed that sentiment on Twitter as well.

"Where is the Whistleblower, or the 2nd Whistleblower, or the 'informant?'" he asked in a tweet on October 20 . "All gone because their so-called story didn't come even close to matching up with the exact transcript of the phone call."

Read More