In an attack on Donald Trump, David French at National Review lists a number of reasons why Trump is a flaming liberal.

Reason #8 is as follows:

Trump has now signaled support for job-destroying minimum-wage increases, in a breathtakingly brazen flip-flop:

STEPHANOPOULOS: Minimum wage -- all through the primaries, you were against an increase. Now you’re saying you’re looking at it. So what’s your bottom line on this?

TRUMP: Well, I am looking at it and I haven't decided in terms of numbers. But I think people have to get more.

STEPHANOPOULOS: But that's a change from where you were during --

TRUMP: It's not a very (INAUDIBLE) ...

STEPHANOPOULOS: --- the primary.

TRUMP: Well, sure it's a change. I'm allowed to change. You need flexibility, George, whether it's a tax plan where you're going to -- where you know you're going to negotiate. But we're going to come up with something.

Well, if raising the minimum wage makes one a liberal, then the following Republican presidents were all liberals, too:

• Dwight D. Eisenhower raised the minimum wage from $0.75 to $1.00/hr in nominal terms, representing a raise from $6.31 to $7.59/hr in 2012 dollars.
• Richard Nixon and Gerald Ford oversaw a nomimal minimum wage increase from $1.60 to $2.30/hr.
• George H.W. Bush increased the nominal minimum wage from $3.35 to $4.25/hr, which translated into an inflation-adjusted raise from $6.18 to $6.96/hr in 2012 dollars.
• George W. Bush presided over a minimum raise increase from $5.15 to $6.55/hr in nominal terms, or $6.72 to $7.02/hr in 2012 dollars.

Ronald Reagan didn't increase the minimum wage, but he did greatly increase federal spending and the national debt, which – when coupled with a protectionist trade policy – must sure make him a liberal in NRO's view as well.

French's reason #3 why Trump is a liberal is that Trump used to support amnesty for illegal immigrants.  Well, Reagan actually did sign an amnesty bill into law, meaning Reagan is undeniably a liberal using the NRO rules.

Thus, using NRO's "rigorous" criteria, there has not been a conservative president since WWII.