They urge Mr Cameron to "exercise leadership and judgement" and release Sgt Nightingale on licence while the case is reviewed.
The U.S needs to exercise leadership among countries in the Hemisphere but making sure that the Democratic Charter signed by members of the Organization of American States (OAS) is implemented.
"So it's really incumbent upon the Security Council members and regional states to exercise leadership and do what we can to help end the violence and get to a political transition, " the official said.
"I expressed my hope and expectations for India to exercise its leadership even more positively and comprehensively, " he said.
He stepped into the Presidency of South Africa in May 1994, but his exercise of great leadership had begun long before.
"The exercise was all about developing individual leadership qualities, " said Titmuss.
The series, which follows Mr. Millan as he works at rehabilitating aggressive dogs, showcases his philosophy that healthy, balanced dogs require strong "pack leadership" from their owners in the form of exercise, discipline and affection.
The publishing of a draft bill looks like an exercise in what Mrs Thatcher used to call "followership" not leadership.
As a starting point, attention to diet, exercise, sleep and mindfulness might be just as important for change leadership as is a knowledge of basic strategy concepts.
But regular, daily exercise also gives you energy and vitality, two very important components of leadership.
Israeli observers have suggested that even if parts of the Fatah leadership are serious about reducing the level of violence, they plainly do not exercise authority over some of the various armed bands.
"It is important for Europe, and to exercise whatever initiatives are possible and necessary, especially for the economy and jobs, the government remains under the authoritative leadership of Mario Monti until a new government is formed, " Napolitano said in a written statement.
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