it is another dirty trick played by Obama admin. They leaked transcript of Flynn phone call with Russian to media (CBS) and even unmasked Flynn name before they interviewed Pence. They knew the whole phone content and designed a trap for Pence by asking Russian contact question. I think Flynn made a careless mistake to Pence, but not intentionally lie to Pence because there is really no purpose to lie to his VP.
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Link: https://www.foxnews.com/media/trey-gowdy-challenges-media-who-unmasked-flynn