Brian Ross reports:

In her most provocative comments, the ex-Mrs. Gingrich said Newt sought an “open marriage” arrangement so he could have a mistress and a wife.
She said when Gingrich admitted to a six-year affair with a Congressional aide, he asked her if she would share him with the other woman, Callista, who is now married to Gingrich.
“And I just stared at him and he said, ‘Callista doesn’t care what I do,’” Marianne Gingrich told ABC News. “He wanted an open marriage and I refused.”
Marianne described her “shock” at Gingrich’s behavior, including how she says she learned he conducted his affair with Callista “in my bedroom in our apartment in Washington.”

Video here.