I removed the previous article because this one has more info.

Obama’s Homeland Security Chief Used Private, Unsecured Email for Official Business

"Former Homeland Security Secretary Jeh Johnson and three other top DHS officials used private, unsecured email to conduct official business and discuss sensitive matters, according to 216 pages of documents obtained by Judicial Watch.

The three top officials were Deputy Homeland Security Secretary Alejandro Mayorkas, Chief of Staff Christian Marrone, and General Counsel Stevan Bunnell......"

"......Judicial Watch played a leading role in the release of emails from former presidential candidate Hillary Clinton’s private server she used to conduct official work while Secretary of State.

The group previously revealed that Johnson and 28 other agency officials used government computers to access personal web-based email accounts, despite a 2014 agency-wide ban on doing so due to heightened security concerns....."

http://www.breitbart.com/national-security/2017/02/13/former-homeland-security-secretary-chief-used-private-unsecured-email-official-business/