The native Iowan also said that his company was hiring and that there was no shortage of talent in Des Moines.

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Meanwhile Mr Cairns' former boss, Scottish Secretary Des Browne, has warned potential Labour rebels there is no alternative to Mr Brown's leadership.

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Des Moines, Iowa's capital, was the first to say no.

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Without a caucus date coming up, we no longer would have that great of a need for an office staff in Des Moines.

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Speaking to the Des Moines Register's editorial board after the event, Clinton said she had "no idea" she would be asked about the pipeline Tuesday.

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