When a President of the United States issues a statement in his official capacity that is designed to misinform, or that is issued without due diligence in looking for the facts, then that is a lie.
to wit - the POTUS giving any support to the idea that the Libya massacre was the result of a public uprising stemming from a u-tube video is a lie when he says it from the official position of President.
If he wants to lie in his fund-raising jaunts, that is dispicable, but after all he is addressing people who came there to be lied to, so it is just normal DEMs being DEMs. Even GOPs do it sometimes.
But, using the office of the presidency in a mendacious effort to do anything but level with the American people is a lie. (see richard nixon)
If what he has to say is too embarrassing, he should just say 'no comment,' until he is forced to do so by public pressure. But to put forth a knowingly false 'reason' is a damnable lie - and he should be called on it by congressional investigation. A much more 'innocent' lie brought down the presidency of RMNixon, and deservedly so. Nixon was my hero, but he lied to me and had to be removed.
Obama lies about everything - but this latest one is by far the most important. Impeachment is not off the table in my opinion. If it was deserved by Nixon, this is orders of magnitude worse.