Whether he lied or not is immaterial
His actions from the day he asked Comey if he could let the Flynn investigation go , to firing him, to admitting on national television to Lester Holt that the Russia investigation played a role in the firing, to a meeting with Russian politicians where U.S. press was banned, and he not only 'decided' to declassify intel and share it right there, greatly comprising relations with allies , but tells them he 'fired that nutcase', all this is the behavior of a man who should have never been in any office whatsoever to begin with, should be impeached and criminal charges should be highly considered.
All those characteristics I listed about you apply because you know this is the truth, yet you just can't bring yourself to admit it. You absolutely can't admit if Obama committed the same acts your be so vehemently defending him ( cause you'd be foaming at the mouth, calling for his head).