Jennifer Rubin: First, the GOP shrinks. Then it should get crushed.

Sane Senate Republicans and critics of President Donald Trump, including Bob Corker of Tennessee and Jeff Flake of Arizona as well as a slew of House Republicans, retired in 2018 rather than face the challenge of reelection in the Trump era. Over the past two weeks, six Republican House members — including one of only 13 women (Susan Brooks of Indiana) and the only African American (Will Hurd of Texas) — have announced their retirement, bringing the total to eight.As CNN notes, &ldqu