National Review is a conservative publication. It was founded by William F Buckley back in the day, and has been one of the original conservative magazine for decades. You are probably thinking of The Nation, which is a lefty rag.
Mind you there are some around here who consider National Review not conservative because it does not tow certain lines (like liking Trump).
There is nothing conservative about the Nat Rev.
It’s libertarian. Buckley was a huge libertarian and since his death, the magazine has moved even further left.