None of those are applicable to Trump.Here are 3 cases in which someone used the phrase "I hope" and were convicted of obstruction.
U.S. v. McDonald, 521 F.3d 975 https://casetext.com/case/us-v-mcdonald-29 screen shot of text
US v johnson https://casetext.com/case/us-v-johnson-1289
US v Chujoy http://www.leagle.com/decision/In FDCO 20160915I98/U.S. v. CHUJOY
I would be more than willing to listen if you can post a link that gives an example with the following:
- the person that stated hope was not being investigated
- the person that stated hope was the boss of the person they were speaking with and had the authority to stop an investigation