On an episode of Business Insider’s podcast, “Success! How I Did It,” Perino told US editor-in-chief Alyson Shontell that there exists what she calls a “fraternity” of former White House press secretaries.

And in case you were wondering, Sean Spicer — who left his position as President Donald Trump’s press secretary in July 2017 — is in that fraternity too. Here’s Perino:

“I never suggest a press secretary, whoever they are, to do something differently. We have an interesting — I call it a fraternity of former press secretaries. You will be very hard pressed to find any press secretary criticising another. This whole time. It’s really quite remarkable.

“Partly because you just know what it’s like to be up there and, you know, walk a mile in her shoes before you criticise. But that said, I think [current White House press secretary Sarah Huckabee Sanders] is doing great. She’s the first working mother to have the job. That’s a big difference ... she’s got three little ones under the age of five.”

Perino did, however, share some words of wisdom for Sanders in an article for Fox News.

For example, she wrote: “Be the most knowledgeable person in the room. Read more than anyone else.” In the interview with Business Insider, Perino said she “always wanted to be the most well-read person in the briefing room,” which was one reason why she was constantly sleep-deprived.

Another tip Perino gave Sanders: “Share the personal side of your life in your job. … Being a mom is definitely a plus in this job. It helps you be more empathetic regarding the big policy decisions that are being made by the president.”