The Obama administration has said it will seek to block a controversial bill describing as genocide the World War I killing of Armenians by Turks.
A congressional panel on Thursday approved the resolution, paving the way for a possible vote by the House.
Prime Minister Recep Tayyip Erdogan said his country had been accused of a crime it did not commit, adding the resolution would harm Turkish-US relations.
President Abdullah Gul said
Change of position
Mrs. Clinton - who had urged the House Foreign Affairs Committee not to hold the vote - said on Friday: "We are against this decision. Now we believe that the US Congress will not take any decision on this subject."
The resolution - approved by 23 votes to 22 by the committee - calls on President Barack Obama to ensure that
A similar resolution was approved by the same committee two years ago, but did not go forward to the House after pressure from the George W Bush administration.
During his campaign for the 2008 election, Mr. Obama promised to brand the mass killings genocide.
Mrs. Clinton has acknowledged his administration's change of opinion on the issue, saying circumstances had "changed in very significant ways".
In October last year,
Hundreds of thousands of Armenians died in 1915, when they were deported en masse from eastern
Armenians have campaigned for the killings to be recognized internationally as genocide - and more than 20 countries have done so.
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