Kurt Bardella is a political commentator and columnist and the former spokesperson for Reps. Brian Bilbray (R-San Diego) & Darrell Issa (R-Vista), both California. Follow him on Twitter: @kurtbardella. The views expressed here are solely those of the author.

(CNN) How enthusiastic were Republicans about Donald Trump's first visit to the Golden State since becoming President to inspect prototypes for his proposed border wall? A column in the San Diego Union-Tribune from Republican Mayor Kevin Faulconer, directed at Trump, was headlined: "there's more to our border than a wall."

Kurt Bardella

The reality is Trump's brand of xenophobia is toxic to what little is left of the Republican Party in California. Consider that California is home to one of the most diverse populations in the world. In 2015, the Latino population there surpassed the white population . That's right, the largest group of people in the state are the ones that the President of the United States has more than once referred to as " bad hombres ."

To say that Republicans in California are on life support would be an understatement. The GOP has been shut out of every statewide political office. They are a permanent minority in the state Legislature. They may not even have a candidate qualify for the November ballot in either the gubernatorial or senatorial contests.

JUST WATCHED Trump touts wall prototypes in San Diego Replay More Videos ... MUST WATCH Trump touts wall prototypes in San Diego 01:17

To understand how dire the situation is for California Republicans -- look no farther than 90 minutes north of the border, in what used to be the Republican stronghold of Orange County -- which is showing signs of decay

Read More