A source told CNN on Saturday that Newt Gingrich is “actively lobbying” to be Donald Trump’s running mate.

The source also added that Mike Pence is very high on Trump’s VP list, and that the Indiana Gov. is getting the “full vet.” Pence isn’t actively lobbying for the job because it’s not his style, the source added.

Retired Lt. Gen. Michael Flynn is also being considered as a Trump running mate, but the source said it is “not clear how intensely,” an indication the general is on the list but may not get the final nod.

Sources have also said that New Jersey Gov. Chris Christie is not out of the running yet. According to campaign spokeswoman Hope Hicks, Christie will be campaigning with Trump in Virginia on Monday.

Earlier in the week, Gingrich told Fox News that if asked, he would serve as Trump’s vice president.

Gingrich told Greta Van Susteren that “If Trump offers the position and is serious about it, which I think he would be after our conversations, listen, I would feel compelled to serve the country.”

Days earlier at the Aspen Ideas Festival, Gingrich called talk that he would be selected “wild speculation.” He said that even if he were to be chosen, he would have to have a “very, very long talk” with his wife, Callista, and then “another long talk” with Trump.