"Asking for advice on how to prove he isn't guilty isn't obstruction"
He Didn't ask for advice, the report clearly states that Trump had ordered the investigation curtailed, but only the unwillingness of the President's staff stopped the order from being implemented. Thats just one thing. The President also asked Comey to END the investigation, according to the report. He tried to get Jeff Sessions to lead the investigation or try to take over. Jeff refused. The firing of Comey The report said that even though the White House relied on so-called independent recommendations for the dismissal from Sessions and deputy attorney general, Rod J. Rosenstein, Trump had decided to fire Mr. Comey regardless of what they said. “The day after firing Comey, the president told Russian officials that he had ‘faced great pressure because of Russia,’ which had been ‘taken off’ by Comey’s firing,” the report said. He also tried to fire Robert Mueller. And thats not even all of it. If youd don't thinks thats evidence of obstruction I don't know what is.