No impeachment is pointless before the election. If he wins a second term you can bet it is an option that would be "on the table". But just lying and passing executive orders wouldn't be enough to get it through congress. It would have to be something dramatic and really obviously illegal. Like knowingly shipping a few thousand automatic weapons into a foreign country resulting in many deaths of their innocent civilians, going against the Supreme Court even after they've ruled against Obamacare, or something really really ugly and bad happening with Israel, Iran situation.