Spurning America's good offices, and implicitly impugning its goodwill, are plainly an awkward corner for Mr Netanyahu to be painted into.

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That does not stop both sides from impugning Mr Ross's objectivity.

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It's also hard not to notice that people now extolling Justice Roberts for rescuing the court's integrity are largely the same ones who have been impugning it.

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And since I have no consulting firm to promote, it might be more appropriate to focus on understanding the message, rather than impugning the integrity of the messenger.

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Ms Palin's argument does at least have one mitigating virtue: it concentrates on the impact the centre might have, without impugning the motives of those who want to build it.

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Retired from his post, but by no means from public life, General Oviedo set out to win the candidacy of Paraguay's (and Mr Wasmosy's) over-mighty Colorado Party for the 1998 presidential election, mainly by impugning Mr Wasmosy's honesty and competence.

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Archbishop Vincent Nichols, the leader of the Roman Catholic Church in England and Wales, and Archbishop Peter Smith, the Archbishop of Southwark, said opponents of gay marriage should lobby MPs "clearly, calmly and forcefully, and without impugning the motives of others".

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