Google said in a research report Wednesday that it detected efforts by Iranian hackers to target both the Trump and the Biden-Harris campaigns in May and June, part of a larger email phishing operation that still persists.

Google’s announcement adds credence to the Trump campaign’s claim Saturday that it had been hacked as part of an Iranian campaign to interfere with the election.

In its report, Google’s Threat Analysis Group, which tracks government-backed cyberattacks, said it had…