WASHINGTON (AP) — Special counsel Robert Mueller is scrutinizing the connections between President Donald Trump's campaign and the data mining firm Cambridge Analytica, which has come under fierce criticism over reports that it swiped the data of more than 50 million Facebook users to sway elections.

Mueller's investigators have asked former campaign officials about the Trump campaign's data operations, particularly about how it collected and utilized voter data in battleground states, according to a person with direct knowledge of the line of inquiry but not authorized to discuss it publicly....