U.S. intelligence had evidence that voter registration systems or websites in seven states — Alaska, Arizona, California, Florida, Illinois, Texas and Wisconsin — were compromised by Russian-backed operatives before the 2016 election but never told the states, NBC News reported on Tuesday.
The Department of Homeland Security denied the report, a spokesman calling it "factually inaccurate and misleading" in a statement.
NBC, citing unnamed U.S. officials, said that top-secret intelligence requested by President Barack Obama in his last weeks in office synthesized months of work and made the conclusions.