Following Friday's carnage in Paris, French and American leaders said they would redouble attacks targeting Islamic State strongholds.
The first Democratic debate in October averaged about 15.3 million viewers. Saturday's viewership fell by nearly half.
The number of injured in the attacks stood at 352, 99 critically.
The two leaders huddled together before the opening session of the Group of 20 summit in the Turkish city of Antalya.
U.S. public opinion already is divided on Syrian refugees, but the Paris attacks are heightening fears about accepting them into the country.
U.S. President Barack Obama vowed to help hunt down terrorists behind Friday's Paris attacks, at a news conference ahead of the summit in Turkey.
Washington already expects France to retaliate by taking on a larger role in the U.S.-led coalition’s bombing campaign against Islamic State.
However, her rival Bernie Sanders received a lot of support in post-debate polls.
The CBS-hosted debate was supposed to focus on economic issues but was overhauled at the last minute to focus on national security after ISIS attacked Paris.
The shift to a national security theme for Saturday's Democratic face-off will likely play to the strengths of the Vermont senator's rival, Hillary Clinton, a focus group said.
A discussion is set for the meeting on Sunday to talk about the Paris terror attacks.
A French national was identified but not named by police, while two Egyptian passports and one Syrian passport were found at different locations in and around Paris.
World leaders, including U.S. President Barack Obama and Russian President Vladimir Putin, expressed shock and anguish over the spate of deadly violence in Paris.
The attacks on Friday are said to be the deadliest violence in the country since World War II.
Three United Continental Holdings flights were on schedule to depart for Paris Friday evening from Chicago, Washington, D.C., and Newark, New Jersey.
In remarks Friday, the president said the United States would stand in solidarity with France following the terror attacks.
Scores of people in Paris were killed and authorities said they believe the attackers have committed suicide. It is still unclear who is responsible for the carnage.
The headliners at a White House meeting were well-known former government officials who are now lobbyists.
In a recent interview, gospel singer Kirk Franklin said the Bible shouldn't be interpreted as "a homophobic manual."
The Change.org petition wants President Barack Obama to replace Chuck Rosenberg as head of the DEA.
The incident comes ahead of U.S. President Barack Obama's visit to Philippines next week for a summit, which will be attended by Chinese President Xi Jinping.
Aung San Suu Kyi's party won a majority in both houses of parliament, which will now elect a president by March, ending 50 years of military rule.
