If Trump can legally "obstruct justice" - which Dershowitz has explained - it does not matter what legal venue he takes.  You may like one more than the other, but that is not how the laws work.   He has the authority to stop investigations, fire, and pardon.  

That is not a bribe and stands no chance in court.  Even if it was true as Trump did not say what you put in quotes, there is no plausible case.  Wink and nods don't hold up in court.  The judge is not a mind reader.