I found it:

Bryan Pagliano, Clinton’s Former Tech Staffer, Will Plead The Fifth In Email Investigation

“It is understandable that attorneys for Mr. Pagliano have advised him to assert his constitutional right not to testify given the onslaught of reckless accusations of criminal conduct that continue to be made by many Republicans — including several running for President — without evidence to support their claims,” read the letter, sent on Wednesday to the House committee investigating the 2012 Benghazi attack. The memo, sent from the House Benghazi Committee Democrats, cited a letter received on Monday from Pagliano’s attorneys.

thinkprogress.org