The Russian offer for international supervision of Syria's chemical weapons has taken yet more of the wind from President Obama's sails.
He is due to start making his case for military action again later tonight. But as Washington Correspondent Robert Moore reports, public support for it is still falling.
This video contains distressing images of the chemical attacks in Syria.
Despite attempts by Russia to forestall US airstrikes and protests on his doorstep President Obama continues to make the case for action in Washington.
Senators are gathering for discussions ahead of a vote which could define his Presidency.
ITV News Washington Correspondent Robert Moore reports:
Capturing the war-weary feeling a short time ago one Senator said to me: "most American children, most American teenagers have no memory of their country not being at war" and he said that has to change.
But the President does have a couple of weapons left to shape this debate. Of course there is the speech to the nation that he will make tomorrow night.
The White House is also distributing thirteen CIA verified and very harrowing videos of the chemical weapons attack on the suburbs of Damascus, here on Capitol Hill.
The President calculating that when the Congress watch that they may change their mind and decide that doing nothing is simply not an option.
Fourteen more countries have signed a statement condemning Syria over its use chemical weapons.
In addition to those who has already lent their support the total now includes 25 countries.
The full list of those supporting the statement is:
- Albania. Australia
- Canada, Croatia
- Denmark, Estonia
- France, Germany
- Honduras, Hungary
- Italy, Japan
- Republic of Korea, Kosovo
- Latvia, Lithuania
- Morocco, Qatar
- Romania, Saudi Arabia
- Spain, Turkey
- United Arab Emirates
- United Kingdom, United States
Former presidential candidate John McCain has said John Kerry was "unbelievably unhelpful" when the Secretary of State said that any strike on Syria would be "unbelievably small."
Kerry says #Syria strike would be "unbelievably small" - that is unbelievably unhelpful
Labour is not serious about Syria and is more interested in political positioning, David Cameron has claimed.
The Prime Minister said the Government put everything desired by the Opposition front bench in its motion for action in Syria.
John Kerry said control of chemical weapons in Syria is restricted to President Assad, his brother Maher and an unnamed general.
Asked if there was anything the Assad regime could do to prevent a US military attack on Damascus, John Kerry suggested the Syrian leader could "turn over every single bit of chemical weapons to the international community in the next week."
"But he isn't about to do it," he said.
He said US evidence was "real evidence that I could take into a court room."
"I've personally tried people who have gone away for long prison sentences or for life for less evidence than we have for this."
Assad offers only "words that are contradicted by facts," he added.
US Secretary of State John Kerry outlined the evidence he was prepared to make public of chemical weapon use by the Assad regime.
He reiterated that the US had declassified evidence of where chemical rockets were fired from, where they landed, as well as who gave orders and when they were made.
John Kerry referenced genocides in Europe and Rwanda in putting forward his case for taking military action against the Assad regime in Syria.
"We need to hear an appropriate outcry as we think back on those moments of history when large numbers of people have been killed because the world was silent," he said.
"The holocaust, Rwanda, other moments, are lessons to all of us today."
"So let me be clear," he continued. "The United States of America, President Obama, myself, others are in full agreement that the end of the conflict in Syria requires a political solution."
But he insisted such a solution was currently impossible if "one party believes that he can rub out countless numbers of his own citizens with impunity using chemicals that have been banned for 100 years."