He wrote a scalding op-ed that appeared in The Washington Post yesterday denouncing Donald Trump in the strongest terms (link here). As I've written here before, when a prominent Republican speaks out against Trump, we should definitely sit up and listen.
Danforth is lamenting how Trump is not a true Republican whilst concurrently worrying about how he's destroying the GOP. I'm not particularly concerned about that party, but what he credits to Republicanism could equally be said about most all Americans -- they want to see the country united, not divided.
Trump, however, gleefully strives to divide America. His hateful nationalism is all about "us versus them." If you're not white or not straight, you're part of "them" and thus don't belong in his "great" America.
Danforth's piece would've been stronger if he focused on how Trump is not only anti-GOP but also anti-USA. He doesn't want to make America great again or stronger or better or kinder or fairer.
Trump wants to make America mean and spiteful and covetous and nasty. He wants to make America just like him.