The outgoing officer's first assistant can automatically fill the position for 120 days, at which point (or before) the President must put forth a nominee, or the President can appoint any other officer previously confirmed by the Senate.

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Meanwhile, First Minister Carwyn Jones has paid tribute to outgoing Chief Medical Officer for Wales, Dr Tony Jewell, who is retiring after six years in the role.

BBC: Welsh NHS chief hails progress but says more to do

In April MasterCard's board met in Singapore where it named Indian-born Ajay Banga, the company's chief operating officer and president, to succeed outgoing chief executive Robert Selander.

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The only access to a phone would have been from the weighing room security officer, who can authorise the use of a Jockey Club mobile for outgoing calls.

BBC: SPORT | Other Sport | Horse Racing | Jockeys in walk-out