GOP obstructionism. What a joke. If only.
The reason Trump exists politically is the republican base has given up on the broken promises of a republican establishment that promises a conservative agenda at election time and then represents the status quo when they get there. 
When they were swept into congress in landslide 2010 & 2014 elections, republican voters stood by in stunned disbelief as republican leadership funded virtually every major Obama initiative. They gave the weak argument that they would be blamed for shutting down the government despite those landslides. 2014 was immediately after a shutdown.  Meanwhile we have a President that would have no problem shutting down the government over Planned Parenthood funding. 
With the possible exception of the Supreme Court nomination (during An election year) there has been no discernible difference between Harry Reid and Mitch McConnell.
Trump is nothing more than chemotherapy for the cancer that is both parties.