The chance that Alaska Gov. Sarah Palin won't be the Republican veep nominee is 15 percent and rising, according to the political prediction market Intrade.

The stock had traded at 3 percent at the start of Tuesday. The movement comes amid news of the pregnancy of Palin's teenage daughter and questions over how thoroughly John McCainJohn Sidney McCainThe peculiar priorities of Adam Schiff Ocasio-Cortez fires back at Lindsey Graham: 'Graham wants to bring back 1950s McCarthyism' Meghan McCain knocks Lindsey Graham for defending Trump's tweets: 'This is not the person I used to know' MORE's campaign vetted her before announcing her as the veep pick last week.