Russia, which supports Mr Assad, has refused to back US pressure designed to force him to step down.
Britain has previously refused to back the ban saying the effect of these chemicals on bees is unclear.
Clinton refused to back down from withering GOP criticism of the Obama administration's shifting explanations about the assault.
But because we refused to back down, and kept fighting, we now stand on the verge of victory.
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It refused to back Mr Berlusconi's tax plans unless he cut the taxes of the southern poor first.
Some 49 Labour MPs refused to back him, even after being put under huge pressure by the party's whips.
It was so bipartisan that partisan members of the committee - and the president - refused to back it.
It was Congress-Samajwadi rivalry that failed to extend the last parliament: Mr Yadav refused to back a minority Congress government.
The Liberal Democrats withdrew their support for the changes after Conservative MPs refused to back changes to the House of Lords.
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Before today Ed Miliband has refused to back or oppose his local council saying it was properly a matter for them.
Ultimately it is his judgement which was on trial today and his judgement which his deputy Nick Clegg refused to back.
However, speaking later after a meeting with the team, Barrichello refused to back down and said they had apologised to him.
Mr Bersani announced the news to his Democratic Party (PD) after many centre-left MPs refused to back his preferred candidate for president.
But France's president, Jacques Chirac, has stridently refused to back away from his candidate, Jean-Claude Trichet, governor of the Bank of France.
And he refused to back Israeli plans to attack Iran's nuclear installations.
Miami had its chances, but Indiana simply refused to back down.
Zhao refused to back down, and the university president called him.
Last week, Leicester chief executive Peter Wheeler refused to back Loffreda, stating only that the club structure will be reviewed as usual over the summer.
What was more shocking through was how the Labour and Conservative Party refused to back Lib Dem plans to give local people the right to sack their MPs.
In talking to reporters before the hearing, he refused to back an earned pathway to citizenship, calling it "a very difficult part" of legislation, but encouraged bipartisan solutions.
For his part Mr Prodi, who first lost power in 1998 after hard-line Communists had refused to back his government's public-finance policy, is clearly determined not to let it happen again.
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Harrington, still a prominent investor, refused to back down.
Prime Minister Benjamin Netanyahu has so far refused to back the principle of a Palestinian state while Foreign Minister Avigdor Lieberman has said the Israeli-Palestinian peace process is a "dead end".
United immediately responded with a goal for Fortune and despite prolonged haranguing by the Boro players, the linesman refused to back down from a controversial decision not to give the South African offside.
Furthermore, other unionised employees at Northwest refused to back the striking mechanics, perhaps sensing that it would hasten the airline's tail-spin into Chapter 11 and a full-scale restructuring that would see many more jobs go.
But they have been firmly resisted by the clubs from the Premier and Football Leagues who refused to back all of the above recommendations and have been angered by accusations they have not gone far enough.
One of the most controversial measures to have come before Holyrood, the SNP's plan to set a minimum price per unit of alcohol was defeated in the last parliament after opposition parties refused to back it over concerns it was illegal and would punish responsible drinkers.
She refused to turn back, until forced to by a soldier who took over the wheel.
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