'Not a serious party': What is left of the Republican Party after the Trump loyalty purge?

In nominating Donald Trump for president for the third time in a row, the Republican Party seems more unified than ever, but that unity is largely the result of the purging of anyone who isn't totally loyal to Trump, leaving behind a party of sycophants and low-grade cultural boosters. McKay Coppins, staff writer for The Atlantic, and former Republican George Conway talk with Alex Wagner and Chris Hayes about what has become and what will come of the Republican Party.