Sans collusion, an obstruction charge wouldn't topple Trump

Perhaps, but Democrats should temper their enthusiasm. Unless the special prosecutor can prove Trump and his inner circle conspired with the Russian government to defeat Hillary Clinton, it is highly unlikely Republicans on Capitol Hill will sacrifice their president for trying to quash an investigation of a non-existent crime. The same is also true if Mueller concludes Trump obstructed justice to protect someone else — like former National Security Adviser Michael Flynn. Republicans won’t remove Donald Trump from office for that offense.

Fair or not, as long as the GOP controls Congress, the president’s fate rests with his fellow Republicans. Mueller cannot compel them to impeach and remove Donald Trump. And since his well-received State of the Union speech this week and the recent passage of tax reform – a major legislative victory — the president’s relationship with conservatives on The Hill has improved…

Lastly, an obstruction of justice charge is difficult to prove because it requires the prosecutor to demonstrate the mindset of the accused. It is a subjective determination, and without strong evidence of Trump’s collusion with the Russian government, Republicans are almost assuredly going believe the commander-in-chief when he insists he did not intend to thwart justice by firing James Comey.