The multiple ways Trump is guilty of a "cover-up"...

First of all, he, along with AG, Wm Barr, decided to keep much of the Mueller report from the public and from the Congress.

Then, they both lied about it and told the public it was something that it was not. It did not say there was "no collusion" and it definitely did not say there was "no obstruction". By withholding the full report, they have covered up the complete facts of the investigation.

Also, they have pressured present and former WH staff to not testify before the Congress, even if they are subpoenaed.

It is hard to see how we can call it anything other than a "cover-up"?