Something that is often overlooked, or unknown, to people outside CA and NY is that there are more (R)'s in the Federal House of Reps from either of those liberal states than from many "deep red" states.
CA has 14 (R) House Reps.
NY has 9 (R) House Reps.
The top 10 "most conservative" states can not match even NY's (R) rep count from AL to WY.
AL has 6 (R) House Reps.
WY has 1 (R) House Reps.
Unfortunately the fact is, due to population, the Republican party needs CA and NY in order to help maintain control of the House.
Otherwise, Nancy Pelosi will oversee impeachment and nearly all the rest of what Trump wants to get done will be even more impossible.
The more the Republican party, and base, ignores the big states...even the liberal ones, the more likely (R)'s are to loose even more control of the congress & executive...and eventually the courts. It's not a good game plan.
Unless there is a law put in place that immigrants (legal or illegal) can not vote for 20 years and every single family in those red states has 5+ children, it's a numbers game that the Republicans are going to find more and more difficult to win at.
The best bet, at this time, is to reform immigration by denying citizenship to any of the 20+ million illegals (and make certain none vote), shut down chain migration, close the diversity lottery, deport all those who overstayed their Visa's, enforce eVerify, build the wall, beef up ICE & other immigration enforcement.
It's a tall order, but we must put pressure on our elected representatives to do these things at a minimum.