The website is the latest in the White House's "flood the zone" push to convince a skeptical Congress — and American public — about the need for military action in Syria.

Obama is currently in St. Petersburg, Russia, for the G-20 economic summit, looking to rally support from world leaders for a strike.

"The president will … have a chance to speak with allies of the United States and key partners to explain our current thinking on Syria," Deputy national security adviser Ben Rhodes said. "And I think we'll continue to work with those countries to see what type of political and diplomatic support they may express for our efforts to hold the Syrian regime accountable."

At a stop in Stockholm Wednesday, Obama said that "Congress’s credibility is on the line" with the vote.

"When those videos first broke, and you saw images of over 400 children subjected to gas, everybody expressed outrage: How can this happen in this modern world?" Obama said. "Well, it happened because a government chose to deploy these deadly weapons on civilian populations."

"And so the question is, how credible is the international community when it says this is an international norm that has to be observed? The question is, how credible is Congress when it passes a treaty saying we have to forbid the use of chemical weapons?"