First, GOP is nothing but a nickname. Our party is the Republican Party. The nickname of the Republican Party didn't get attached to it until 1888. Previously, the nickname had been used by Southern Democrats. After the Republicans won back the Presidency and Congress for the first time since the Grant administration, the Chicago Tribune proclaimed: "Let us be thankful that under the rule of the Grand Old Party ... these United States will resume the onward and upward march which the election of Grover Cleveland in 1884 partially arrested."
Second, there is nothing wrong with the Republican Party. It has simply been infiltrated by too many RINOs beholden to the lobbyists. Trump gives us a chance to get back to our roots hopefully by exposing them and just maybe converting some based on his popular strength.
I am glad my old history teacher was able to make to the party today. Dude, you must be 100 years old by now.