This is from Bill Kristol:

I’d take in a heartbeat a group of newly naturalized American citizens over the spoiled native-born know-nothings of CPAC, who today booed at the mention of citizenship naturalization ceremonies.

— Bill Kristol (@BillKristol) February 24, 2018

While I've described it as another "Mask Comes Off" moment, it's hard to say that for Kristol, the mask has even been on.

Here's something Steve Sailer noted in August of last year:

During a discussion with Charles Murray in February 2017, William Kristol, founding editor of The Weekly Standard, said that replacing the white working class with immigrants was starting to strike him as a good idea:

Look, to be totally honest, if things are so bad as you say with the white working class, don’t you want to get new Americans in? Seriously, you can make the case—this is going on too long and this is too crazy, probably, and I hope this thing isn’t being videotaped or ever shown anywhere. Whatever tiny, pathetic future I have is going to totally collapse.

You can make a case that America has been great because every—I think John Adams said this—basically if you’re a free society, a capitalist society, after two or three generations of hard work everyone becomes kind of decadent, lazy, spoiled—whatever. Then, luckily, you have these waves of people coming in from Italy, Ireland, Russia, and now Mexico, who really want to work hard and really want to succeed and really want their kids to live better lives than them and aren’t sort of clipping coupons or hoping that they can hang on and meanwhile grew up as spoiled kids and so forth. In that respect, I don’t know how this moment is that different from the early 20th century.[Emphases added.]

Note: This transcription isn’t perfect but I don’t think it misstates the video.

Keep in mind that Kristol had been moderately immigration-restrictionist.

And yes, it was being videotaped—you can watch it:

In 2006, when a horrifying Republican amnesty was being contemplated by President G. W. Bush, and the Republican Senate (but not the House, or as it turned out, the Republican voters) Kristol [Email him] wrote this:

Y is for Yahoo

Turning the GOP into an anti-immigration party could dash Republican hopes of becoming a long-term governing party.

By William Kristol, Weekly Standard, April 10, 2006

That's his basic position, and I think it's because he regards immigration and naturalization (as above) as literally sacred.  In the past he has been willing to wear the mask, though—see Bill Kristol Deserts Sinking Amnesty/ Immigration Surge Ship On Laura Ingraham Show from 2013, which is the moderate immigration restriction Steve was talking about. I wrote:

Kristol realizes that this issue is riling up the base, and will damage his conservative credentials, such as they are. He thinks they should try more gradually, or stealthily, depending on whether he said “discrete” or “discreet” pieces of legislation, (the Daily Caller has “discreet” but it's a transcript). But either way, he doesn't want to get caught with his base down.

In fact, he's hoping, he says, to “come back in 2015 when there are more Republicans in Congress, come back in 2017 when perhaps there is a Republican president and address these issues,” which is only going to happen if Rubio and the Republicans don't anger the voters.

Well, they did, and and we got Trump.