White lies, or lying for the greater good were considered permissible or even commendable under certain circumstances, while perjury, to give false testimony in a legal matter, was considered a grave sin. If one was found to have committed the sin of bearing False Witness, some ancient Rabi's, like Maimonides, mandated that the price was to have the same damage done to the other done to you, aka "An Eye for an Eye."
The Catholic understanding of this commandment is that there is no real destination between the forum in which an untruth takes place, and thusly it is accepted as a blanket prohibition against misrepresenting your own or other's character. Generally speaking we accept that there are 5 major actions that fall under the heading of bearing false witness: detraction (needlessly damaging someone's good name, even with truth), calumny (damaging someone's good name with falsities), gossip (spreading unverified rumors true or untrue), rash judgement (leaping to and publicizing damaging conclusions with insufficient evidence), lying, and violation of secrets.
If the FBI director's claims are true, than Donald Trump may be guilty of Calumny, Gossip (Apparently the origin of his claim of wiretapping may have been an article on a spurious "news" website), rash judgement, and/or outright lying. All with the intent of defaming his predecessor.
We now live in an age of "Alternative Facts," and "Fake News." As spiritual beings and Good Citizens we must be vigilant not to fall into the same trap that this president may have.
To quote William Shakespeare, "No Legacy is so rich as Honesty."