This seems to be part of a larger hunt, started by the Trump admin, to discredit the Steele Dossier and discredit the accusations that Trump was in bed with the Russians.

The instances of him lying to the FBI included that when asked if he ever talked with a particular source, he said no. In reality, he had emailed with that source (not talked with). Misleading probably, but I don’t think that’s a strong case.

The other instance of lying was that he said he thought an anonymous source was a certain person, but he was wrong. Again, this is not lying because he didn’t say he knew for sure, but rather that he thought.

I don’t suspect there is a strong case here and it appears to be 100% political.