Bob Perciasepe (Ron Thomas/AP)

After all, he’s sticking around in the No.2 slot — much to McCarthy’s relief.

Perciasepe, a low-key policy wonk who can also work the brutal politics on environmental issues, had been given high marks during his tenure as acting administrator after former chief Lisa Jackson left in February. And he knows the agency, having run the air and water divisions in the Clinton administration.

So why not leave? Well, one reason he’s feeling okay about his status, we’re hearing, may be because President Obama called him when he picked McCarthy and personally asked Perciasepe to stay.

Sounds like this may be an unusual presidential call to a deputy of a non-statutory cabinet agency.