Update to this story.

Via NYDN:

Nielsen has conducted an investigation into the ratings for Megyn Kelly’s new Fox News Channel show, “The Kelly File,” following grousing by MSNBC chief Phil Griffin.

The investigation has revealed that the numbers for Kelly are accurate.

Last Tuesday, the day after its debut, “The Kelly File” doubled its audience, crushing “The Rachel Maddow Show,” its MSNBC competition.

Griffin called for a probe, dubbing the ratings feat “impossible.”

Nielsen executives declined to comment.