He challenged each recipient to start a company instead of sitting in a lecture hall.
He challenged the veterans to come up with an alternative way to raise revenues.
He challenged Gordon Brown over whether he still believed he had ended boom and bust.
Following the phone-hacking scandal, he challenged newspapers to help develop a new system of regulation.
He challenged the conviction but judges at the Appeal Court in Edinburgh refused his appeal.
He challenged the 40% figure for gun sales without background checks -- particularly at gun shows.
The Democratic incumbent whom he challenged was the son of the judge who received a ricin-laced letter.
After watching us hopelessly slip and slide about on the sheet, he challenged us to a match.
In the home team's locker room he challenged the executives to put themselves in the shoes of investors.
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Then, three years later, he challenged the same points when I repeated them in an article for Frontpage.
Moreover, even as he challenged black establishments, Williams gathered friends in white ones.
In 1994, he challenged the popular, acerbic Democratic governor of Texas, Ann Richards.
He challenged the banning of the army training corps from the Harvard campus.
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When he challenged Mr Ortega, whose politics remain those of the hard left, he was kicked out of the party.
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W. Bush, when he challenged the last Democratic nominee from Massachusetts in 1988, drawing character as well as policy distinctions.
But, in separate exchanges, he challenged Mr Cameron to "get a grip" over the funding of Sure Start children's centres.
He said the UN had passed resolutions condemning Libya based on "false reports" and he challenged the UN to investigate.
Ms Lamont, for example, drew attention to Dennis Canavan's BBC interview in which he challenged the concept of a sterling zone.
He challenged start-up operators to take risks, which made some owners fearful, but made him a hero among New York foodies.
He challenged the supervisor who admitted it was a glitch in the system and they'd had lots of complaints about it.
He challenged the shop to build up inventory of all 40 pieces.
He challenged Ted Kennedy in a 1994 Senate race but lost badly.
He challenged Mr Salmond to explain why the advert was so expensive.
She didn't support Mr. Thompson when he challenged Mr. Bloomberg in 2009.
Hamilton counterpart Tomas Cerny looked less convincing as he challenged Steve Lovell for the ball on the edge of his six-yard box.
He challenged the global community to support The Global Fund to Fight AIDS, Tuberculosis and Malaria, and called on Congress to uphold its commitments.
He challenged them to create a picture of Duke that did them better justice, by joining their intelligence to their exercise of high spirits.
Helen Newlove, 48, has become a champion of victims' rights since her husband was murdered by youths he challenged outside their home in 2007.
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Bu the video referee judged that the ball had been knocked forward by the New Zealand winger as he challenged Carney in the air.
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He challenged our reason for being, what we thought, how we lived, the truth or falsity of what we believed to be true or false.
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