President Barack Obama opened the door to a diplomatic way out of the crisis in Syria -- while refusing to close the door on military intervention -- in a nationally televised speech Tuesday night.
Here are key developments from Capitol Hill, the White House and across Washington before, during and after the president's address.
10:44 p.m. ET - House Intelligence Committee Chairman Mike Rogers in a statement said he's "hopeful a diplomatic solution can be reached, however, I am skeptical of any proposal proffered by the Russians and doubt Assad's motives for agreeing to this plan ... the President still urgently needs to develop and execute a coherent strategy to address all of those threats."
10:34 p.m. ET - 6 in 10 Americans who watched the president's speech tonight said they favor his approach, according to CNN's instant poll taken after Obama spoke. Sixty-one percent said they support the president's position in Syria and 37% said they oppose his response.
The poll indicated that nearly two-thirds of those who watched the speech think the situation in Syria is likely to be resolved through diplomatic efforts, with 35% disagreeing. Speech-watchers were divided on whether Obama made a convincing case in his speech for U.S. military action in Syria, with 47% saying he did and 50% saying no.
10:26 p.m. ET - National Security Advisor Susan Rice tweets: "POTUS: when dictators commit atrocities, they depend upon the world to look the other way until those horrifying pictures fade from memory."
10:18 p.m. ET - CNN's John King tweets: "post #syria speech POTUS still faces #GOP #congress doubts: @ChuckGrassley says leaning no; @SenOrrinHatch still "strong reservations."
10:11 p.m. ET - CNN's Dan Merica tweets: "Another undecided D break Syria silence. MT @RepRickLarsen President takes diplomatic opening, Syria must match its words with deeds."
10:03 p.m. ET - Republican Senators Lindsey Graham and John McCain issued a joint statement saying, "We appreciate the President speaking directly to the American people about the conflict in Syria. We regret, however, that he did not speak more forcefully about the need to increase our military assistance to moderate opposition forces in Syria, such as the Free Syrian Army. We also regret that he did not lay out a clearer plan to test the seriousness of the Russian and Syrian proposal to transfer the Assad regime's chemical weapons to international custody."
10:01 p.m. ET - Reacting to the speech, Republican Sen. Charles Grassley, who met with Vice President Joe Biden yesterday and with the president today on Capitol Hill said, "I don't think the case for military action has been made ... I'm still leaning against the authorization for the use of force that's been presented.
10 p.m. ET - CNN's Dan Merica tweets: "@ChrisMurphyCT, a Democratic senator who was against strikes from the beginning, tweets "Good speech. President right to delay vote."
9:59 p.m. ET - Sen. Lindsey Graham, R-South Carolina, tweets: "After this impassioned plea I cannot imagine Pres Obama not launching military strike if diplomacy fails, regardless of what Congress does.
"You cannot make moral case as the leader of the Free World and then refuse to act if diplomacy fails. #SyriaSpeech."
9:58 p.m. ET - Democratic Sen. Levin, chairman of the Senate Armed Services Committee, in a statement said "I believe Congress can best support the goal of a diplomatic solution by approving a resolution that authorizes the use of force if Syria refuses to give up its chemical weapons."
9:54 p.m. ET - Republican Sen. Rand Paul on CNN said he hopes the Russia/diplomatic option works because if we attack, Syria will be more unstable. Paul said the chance al Qaeda gains traction in the region increases if the United States attacks.
9:45 p.m. ET - The Progressive Change Campaign Committee, a left-leaning advocacy group that has been opposed to military action in Syria, responded to the address saying "public pressure worked."
"The American people knew that diplomacy was a credible and strategic option, and this great news from President Obama will be better for America and his presidency than dropping bombs on Syria," the group said in a statement.
9:43 p.m. ET - Republicans National Committee Chairman Reince Priebus responded to the president's address by saying, "The administration's handling of the U.S. response to Syria has been so haphazard it's disappointed even the president's most ardent supporters."
"This rudderless diplomacy has embarrassed America on the world stage. For a president who campaigned on building American credibility abroad, the lack of leadership coming from the Oval Office is astounding," Priebus added.
9:42 p.m. ET - House Minority Leader Nancy Pelosi, D-California, tweets: "Pres. Obama's leadership brought diplomatic solutions back to the table, shows his willingness to exhaust every remedy before use of force."
9:40 p.m. ET - CNN contributor Donna Brazile tweets: "POTUS must keep the threat of military action on the table until #Syria gives up its chemical weapons and an int'l team can verify. #peace."
9:31 p.m. ET - CNN Senior Political Analyst David Gergen tweets: "Very good Presidential speech -- crisp, clear, addressed doubts. Not sure enuf to to persuade anywhere close to majority. @AC360."
9:30 p.m. ET - Ari Fleischer, a spokesman for then-President George W. Bush and now a CNN contributor, tweets: "Assad denies using CW that O deplores. Putin sides w Assad. So O turns to Putin & Assad 2 get rid of weapons that weren't used."
9:28 p.m. ET - CNN's Jake Tapper tweets: "A speech to a public that doesn't want to go to war by a president who doesn't want to go to war."
9:24 p.m. ET - Democratic Rep. Elijah Cummings of Maryland, who is still undecided on a military strike, said the president made a "great moral argument," especially when he said U.S. troops could be gassed. But he still has to make it clear that this will not "mushroom into something else."