Starbucks says it is improving customers' in-store experience as it competes with homegrown rivals.

The warning to US officials comes as at least three people die in the latest strikes at an airport and an oil field.

The ad by Ohio Republican Vivek Ramaswamy features his Democratic rival's estranged mother, who she has not seen since her stepfather was charged with sexual abuse in her childhood.

Both men have denied having any knowledge of Epstein's crimes and their attorney rejected the lawsuit as "categorically false".