The issue focused on the former President's money-laundering case, in which an international police investigation was carried out.

Welch is not the only high-profile American to be named in the latest investigation.

The US State Department's official watch list of people with top-secret security clearances is also now being updated, and was last updated in 2012, and this year.

The US government has said that the list is "unprecedented" in its size, and that