From the Brookings Institution:
"Attempts to stop an investigation represent a common form of obstruction. Demanding the loyalty of an individual involved in an investigation, requesting that individual’s help to end the investigation, and then ultimately firing that person to accomplish that goal are the type of acts that have frequently resulted in obstruction convictions, as we detail. In addition, to the extent conduct could be characterized as threatening, intimidating, or corruptly persuading witnesses, that too may provide additional grounds for obstruction charges."
. . .
"While those defending the president may claim that expressing a “hope” that an investigation will end is too vague to constitute obstruction, we show that such language is sufficient to do so. In that regard, it is material that former FBI Director James Comey interpreted the president’s “hope” that he would drop the investigation into Flynn as an instruction to drop the case. That Comey ignored that instruction is beside the point under applicable law. We also note that potentially misleading conduct and possible cover-up attempts could serve as further evidence of obstruction. Here, such actions may include fabricating an initial justification for firing Comey, directing Donald Trump Jr.’s inaccurate statements about the purpose of his meeting with a Russian lawyer during the president’s campaign, tweeting that Comey “better hope there are no ‘tapes’ of our conversations,” despite having “no idea” whether such tapes existed, and repeatedly denouncing the validity of the investigations."
. . .
While the matter is not free from doubt, it is our view that neither the Constitution nor any other federal law grants the president immunity from prosecution. The structure of the Constitution, the fundamental democratic principle that no person is above the law, and past Supreme Court precedent holding that the president is amenable to other forms of legal process all weigh heavily in favor of that conclusion. While there can be debate as to whether a sitting president can be indicted, there is no doubt that a president can face indictment once he is no longer in office. Reserving prosecution for that time, using a sealed indictment or otherwise, is another option for the special counsel."
http://tinyurl.com/y9uxczvb
https://www.brookings.edu/wp-content/uploads/2017/10/presidential-obstruction-of-justice-the-case-of-donald-j-trump-final.pdf?wpmm=1&wpisrc=nl_daily202
