The data breach controversy that erupted Friday centered on the Democratic National Committee’s trove of voter information. The campaigns can use the database to target voters and anticipate what issues might motivate them.

Hillary Clinton’s aides said the information that four of Bernie Sanders’ workers reviewed in 25 searches included her campaign’s details on voter turnout and candidate preferences, revealing the Clinton campaign’s approach in early voting states. Experts said the Sanders campaign employees who accessed the information without authorization appear to have broken the law.

“Our data was stolen,” Clinton campaign manager Robby Mook said. “The data that they reached in and took from our campaign is effectively the strategic road map.”

Sanders’ campaign fired a worker involved in the data breach and admitted the worker’s actions were “unacceptable.” But the campaign rejected allegations that the Sanders team stole data.

– The Associated Press