By all means a uniparty does exist. There are a number of "republicans" who are liberal statist establishment RINO's, members of the uniparty. They're not even remotely republican, they're neither conservative, nor libertarian, nor any combination thereof. There are people such as Paul, Massie, Cruz, Higgins, Roy, Blackburn, and Hageman. Then there are people like McConnel, McCarthy, Buck, Cheney, Snow, Collins, Murkowski, and Romney. The first group are republicans.The others are part of the uniparty.
However, they're not "red", they're "purple", and maybe the worst of all.
Unfortunately, it is about sides, and there is no longer a "loyal opposition, and it is past time to stop treating leftists as if they are the "loyal oppositi0on. They ceased being that decades ago. They're not people who have different ideas on how to make the nation better. They're enemies of liberty, looking to fundamentally alter the Republic the Founding Fathers gifted us. And they're willing do to anything necessary, at any cost to do so. To ignore that fact is fatal naivete. They have for decades counted on being accepted as the "loyal opposition". They're no more "loyal opposition than Lenin, Marx, Stalin, or Mao.