As Hillary Clinton is parrying questions about her ethics and transparency in using a private email system as secretary of state, a taxpayer watchdog group is raising concerns about a former top aide at the State Department and his success in raising hundreds of millions of dollars for the Clinton Foundation.

The Foundation for Accountability and Civic Trust, which last week urged the Justice Department to probe Clinton’s use of a private email account, is now demanding emails and memos from her former state deputy protocol chief, who raised $248 million for the foundation, some from foreign governments, and who is now Clinton’s 2016 fundraising boss.