Disaffection has often driven down turnout among Arab Israelis, but there is a strong push to get rid of the right-wing governing coalition.
Governments and companies are scrambling to protect their websites, as Amazon says it experienced attacks before the warning was made public.
Starbucks says it is improving customers' in-store experience as it competes with homegrown rivals.
Prime Minister Mark Carney dismissed the claim, noting that it was the that US initiated trade actions against Canada.
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".
César Jáuregui Moreno is accused of allowing US agents to join a raid on a suspected drugs lab in April.
Test results have confirmed his diagnosis as a lung adenocarcinoma that was localised.