Those always-crazy Republicans …
"The Republicans in Congress had no intentions of giving up their opposition to the federal government just because their party had captured the White House. Eisenhower's principal adversaries throughout his tenure as president were not the Democrats but the calcified wing of the Republican party, which continued to live in the shadow of Calvin Coolidge and to see Communists under every bedstead." p.581 - Eisenhower: In War and Peace.
Folks like Cruz and Ryan are not the exception - they represent a constant wing of the GOP that now seems to have won the day. The GOP has always been a haven for these mavericks of mayhem, but whereas in the past, there were Republicans of wiser bearing, the far-right has now occupied virtually the whole of the GOP.
The media, of course, love them - they're the Steve-Martins of politics, making fools of themselves while purporting to have the facts and insider knowledge. When, in reality, they're but privileged children, given to bullying, lacking sound judgment and pretending to be wise.