Stocks fall as Boehner announces support of Obama on Syria

The Dow Jones Industrial Average started the morning strong, rising nearly 132 points to 14933.35 before Obama met with congressional leaders on his call to punish Syria for allegedly using chemical weapons on Syrian civilians. 

Stocks had responded in part to robust manufacturing data. The sector expanded last month to 55.7, up from 55.4 in July, the strongest period all year and the best showing since June, 2011, suggesting that activity may be gearing up again, the Institute for Supply Management reported on Tuesday.

After the meeting, BoehnerJohn Andrew BoehnerDems face hard choice for State of the Union response Even some conservatives seem open to return to earmarks Overnight Finance: Trump, lawmakers take key step to immigration deal | Trump urges Congress to bring back earmarks | Tax law poised to create windfall for states | Trump to attend Davos | Dimon walks back bitcoin criticism MORE said, "I'm going to support the president's call for action, and I believe my colleagues should support the president's call for action." House Majority Leader Eric CantorEric Ivan CantorEric Cantor: Moore ‘deserves to lose’ If we want to make immigration great again, let's make it bipartisan Top Lobbyists 2017: Hired Guns MORE (R-Va.) also issued a statement of support. The two statements make an attack on Syria more likely. 

Once the Boehner publicly said he would support the president, the Dow quickly fell more than 100 points.

At midday, the Dow was in negative territory at 14798.03. 

The S&P 500 had risen 16 points to 1651.35 before the congressional meeting with Obama ended but had lost most of those gains in the aftermath. 

An attack on Syria has the potential to increase turmoil in the Middle East, source of much of the world's energy supply.