Trump, contradicting the many and diverse scenarios outlined by White House staff to "explain" the Comey firing, admitted on national television that he fired Comey simply because a number of FBI investigations were putting heat on the White House. This is, de facto, an admission by Trump that he had obstructed justice. Trump asking Comey for a declaration of "loyalty" in a private dinner constitutes obstruction of justice. Trump asking Comey to stop the FBI investigation into Flynn's contacts with Russian figures constitutes an obstruction of justice. There are, of course, additional examples.