Heritage Action for America opposes President Obama’s proposed resolution on Syria and could score GOP lawmakers' positions on it, a move that could depress Republican votes for the legislation when Congress votes as early as next week.

The conservative advocacy organization cited a bullet point list of reasons, produced by the affiliated and typically hawkish Heritage Foundation, for its opposition to "missile strikes in Syria." The foundation argues, among other things, that U.S. interests are not at stake in Syria and that the U.S. should work with allies in the region to remove Syrian President Bashar Assad rather than intervene militarily.

President Obama is asking Congress to authorize limited military strikes against the Syrian regime in retaliation for an Aug. 21 chemical weapons attack that killed more than 1,400 of its citizens, including 400 children.

Should Heritage Action score lawmakers' votes on the Syria resolution and include that in voting-record information it provides to conservative voters, fewer Republicans are likely to vote for the resolution, particularly in the House where Republicans control 233 votes and the resolution will need 218 votes to pass.

House Speaker John Boehner, R-Ohio, and House Majority Leader Eric Cantor, R-Va., announced Tuesday that they support Obama's call for military intervention in Syria. But Boehner made clear through a spokesman that rounding up votes in support of a war resolution is Obama’s responsibility.