Unfortunately, I think they're operating under the "tit-for-tat" rule as applied by the Republican Congress to President Obama. Not that that makes it okay.
You would be wrong.
The Republicans helped serve much of Obamas agenda to him on a silver platter and looked the other way when Constitutional abridgment and corruption were evident.
Plus, they went right along with the Democrats to surrender congress' own duties and obligations to the Executive branch.
Of course now that Trump is in the White House - it is time for total obstruction, so when they get it back the GOP can once again help finalize the Imperial Presidency they have helped the Democrats create.