Sarah Palin attends a rally for Donald Trump in Cedar Rapids, Iowa, Feb. 1, 2016. (Photo by Mark Peterson for MSNBC)

Palin: I'll work to oust Paul Ryan

Sarah Palin said Sunday that House speaker Paul Ryan's hesitancy to back Trump was fueled by ambitions to run for president in 2020 and hinted that she would work to oust Ryan for his reluctance.