Only a few weeks before the 2016 election, WikiLeaks published the emails of John Podesta, chairman of Hillary Clinton’s presidential campaign. Those emails were stolen from his email account through a data breach and ultimately helped derail Clinton’s bid for the presidency.

A few months later—two days before the 2017 presidential election in France—hackers leaked nine gigabytes of emails from candidate Emmanuel Macron’s campaign. The same cybercriminals behind that hack have since been linked to attacks on other campaigns in countries throughout Europe.

The 2020 US presidential election will be no different. In fact, unless candidates take the steps needed to protect their staff, voters, and donors, it could be worse.