Obama’s EPA chief resigned over the Keystone pipeline?

EPA chief Lisa Jackson suddenly resigned last week because she was convinced that President Obama is planning to green-light the controversial Keystone XL oil pipeline, The Post has learned.

“She was going to stay on until November or December,” said a Jackson insider. “But this changed it. She will not be the EPA head when Obama supports it [Keystone] getting built.” …

And Jackson has told insiders that the president will approve the project this time — perhaps as soon as March or April.

Jackson’s spokeswoman, Victoria Rivas-Vazquez, referred back to the original announcement that she wanted to “pursue new challenges, time with her family and new opportunities.”