Washington Post  June 21, 2017   

"Obama’s homeland security secretary just unloaded on the DNC"

"Democratic National Committee refused to accept help from the Department of Homeland Security, even after its email systems were hacked."

"Johnson explained that the DHS had actually helped other departments with suspected hacks, and had been able to stem the damage — but the DNC just wasn't interested.
“I recall very clearly that I was not pleased that we were not in there helping them patch this vulnerability,” Johnson added."

"By now, the rest is history: Hackers leaked the contents of internal DNC emails, and the damage was done."

"Remember: This was a Department of Homeland Security that reported to President Obama, a president from the same party."