President Barack Obama has hit out at America's powerful gun lobby for orchestrating a campaign of "lies" and "scare tactics" about the potential impact of tighter weapon laws.
The National Rifle Association had warned its members the proposal would require checks for sales and gifts between family and friends and lead to a national registry.
Mr Obama did not mince his words after seeing a Senate vote for reform fail to pass.
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William's comments came during a surprise appearance at an event scheduled for just his brother.
Matt Campbell, who collapsed just a few miles from the finish line, had hoped to raise £2,500.