A data analytics firm has helped big health insurers cut payments to doctors, raising concerns about possible price fixing.

Andy Litinsky, who helped start the former president’s social media company, revealed Mr. Trump’s last-minute doubts about an agreement that made them all very wealthy.

The super PAC, Battleground California, said it would drive turnout among voters of color to try to flip seats that are seen as crucial to winning control of the House this fall.