The problem is practically anything the President does can cause obstruction. If Trump looks at you with the old stink eye that's a legit threat because he just happens to be the most powerful man in the world. Trump sneezes and the World has to hold its breath and see what happens. Look at my country, Canada. Our Uber-Liberal self confessed feminist Prime Minister Justin Trudeau is in much deeper doo doo because of some third party extremely veiled suggestions that were made during a bribery case involving a large Canadian engineering firm.
In addition I'd just like to give some friendly advice to the Democratic Party supporters, stop trying to impeach the guy. Step back, work on a strong grass roots network, find a bullet proof nominee and let Trump hang himself. If he gets impeached that will mobilize the Republicans like nothing ever before and their next candidate will win the 2020 election.