Presidential Lies

I do think it's okay for presidents to lie, but then again i don't. There are times when is it may be necessary for a president to lie. Like for example if something were going on that didn't yet to seem to put the United States in any harm or danger, then it'd be okay for him to lie. Because if the president were to tell the american people, it would make him look bad or as if they had no control over the whole situation. That would make the president seem as if he were weak or had no power at all. But if it were a situation that the president knew was going to put the U.S in any harm, like an attack or war was going to start. Then that should definitely be something that all of the American people should know and not be kept a secret. Because if the people were to find out about something serious like a possible attack was going to happen, i'm pretty sure they wouldn't be able to trust the president again.