What’s not to like about U.S. senator-wannabe Daniel McCarthy’s plan to annex Mexico?

Nice beaches. Plenty of oil. A surplus of hard-core drugs that Americans devour. No need for a border wall.

And letting nearly 130 million Mexicans become U.S. citizens? Priceless.

Think it's crazy? No. This wealthy Arizona dude, who's challenging Sen. Martha McSally in the Republican primary, is serious as hell.

Half of Mexico wants to be citizens?

McCarthy beat McSally to the punch with that awing idea this week, telling a radio station, as reported by RealClear Politics, that “adding some ‘beachfront property’ to U.S. territory might be nice.”

“Clearly 30 million Mexican illegal immigrants want to be United States citizens, probably half the country wants to be United States citizens,” said McCarthy, the owner of a cosmetics company.

McCarthy is way off on the numbers, but he’s onto something with part of his statement. There are an estimated 12 million undocumented immigrants in the United States who do want to legalize their status.

Half of Mexico’s residents want to become U.S. citizens? No idea how he knows this. But hey, at least he has “consultants” who wisely advised him to pitch his idea to Americans first.

I’m sure Mexico, which has long been a playground for Americans and now is President Trump’s favorite punching bag, would be eagerly waiting to hear what voters think of McCarthy’s proposal.

This is an extension of Trump's policy?

No joke, folks. The McCarthy campaign told RealClear Politics the proposal is an extension of Trump’s immigration policy.

I thought he was way off on this point, too. But is he?

Trump is betting his 2020 re-election bid on building a border wall at any cost, dumping asylum seekers on Mexico and vilifying Mexicans as “murderers” and “rapists.”

Then again, he’s also the guy with those kinds of ideas. Remember when Trump recently floated the idea of buying Greenland?

The only puzzling thing here is why didn’t Trump think of annexing Mexico? Guess it's never too late for him to steal McCarthy’s idea.

Even this wackiness won't play in Arizona

Seriously, though, enough of this nonsense.

Arizona is either doomed with this type of Republicans or on the road to salvation because they’re making it easier for voters to see through their thin veneer of sanity. McCarthy can kiss off his political aspirations, and Arizona Republicans better watch out.

A lot has happened since Donald Trump carried Arizona by less than 4% in 2016, including the fact that voters rejected Trump loyalist McSally’s bid for the U.S. Senate last year. Trump’s support may be enough for the former fighter pilot to secure the party’s nomination in 2020, but it may be not be enough to win the general election.

McSally is knee-deep with Trump’s America First policies that are ripping the country apart. McCarthy's talks of annexing Mexico will help McSally sweep him out of the way, but they also further sink the Republican Party into the depths of wackiness.

Elvia Díaz is an editorial columnist for The Republic and azcentral. Reach her at 602-444-8606 or elvia.diaz@arizonarepublic.com. Follow her on Twitter, @elviadiaz1.