If aliens exist and the US government knows about them, do you think they would disclose this publicly?

Why? They won’t even disclose whether they have ties with the Russians before, during and after the election! They won’t even disclose tax records!
You ascribe to an x-files theory that the government is capable of a mass coverup of unprescendented scale.
There’s no end to that theory. If you accept that, then we never went to the moon, the earth is flat and they don’t want us to know it, and aliens live among us.
The unfortunate reality, however, is our government is full of bungling fools that can’t even keep Wikileaks from finding out about our secrets!
Do you think Wikileaks might be in on it too?