Hi Ayock, the operative term here is "tried". So yes Trump "attempted to obstruct of justice" but didn't ever do it.
And this isn't like attempted robbery where someone unsuccessfully tries to rob something. This is more like "I wish I could rob that bank." But you dont actually do anything.
And lets put this to rest once and for all - why didnt Mueller charge ANYONE with obstruction of justice ? Cuz despite what the so-called experts are claiming, if Mueller could have, he would have.