Not the exact quote, but close: 'People become more honest when they're no longer in government.' Edward Snowden repeated this, someone else's, remark recently when Eric Holder, the former US attorney general, said something about Snowden's situation.
It's nice if a politician for once doesn't mince words:
http://www.theguardian.com/politics/2016/jun/05/john-major-nhs-risk-brexit-pythons-johnson-and-gove
Not the exact quote, but close: 'People become more honest when they're no longer in government.' Edward Snowden repeated this, someone else's, remark recently when Eric Holder, the former US attorney general, said something about Snowden's situation.