The latest on president obama's push for a military strike against syria. He's about to head home from the g-20 summit in russia. Abc's jon karl is there. And, jon, the president working the phones of... See More
The latest on president obama's push for a military strike against syria. He's about to head home from the g-20 summit in russia. Abc's jon karl is there. And, jon, the president working the phones of congress, twisting the arms of world leaders. But not a lot of public support yet. Reporter: That's right, george. Right now, it appears only france would take part in a u.S. Military strike on syria. But the biggest problem for the president is back at home, where support in congress for military action is tankin with or without help from abroad, the president's national security team is now preparing for something of a shock and awe campaign. Abc news has learned preparations are under way for an attack that would involve a relentless two-day assault of missiles and long-range bombs, fired from u.S.-Based bombers. As well as tomahawk cruise missiles, fired from the navy destroyers in the mediterranean. President obama wants congress to give him authorization but on that score, he seems to be ed headed for defeat. And members of congress say they are being flooded with calls. There's no question. What's coming in is overwhelmingly negative. Reporter: If congress were to vote today, vote counters in both parties say he would lose. Abc news' own vote count shows more than 200 members of the house poised to vote no. Fewer than 50 suggest they would support the resolution. Those who do are getting an earful. My short answer to this is not no. But hell, no. Wanting the u.S. To bomb my country, that's a big deal. Reporter: At a town hall MEETING, john McCain, one of the few vocal supporters of military action, got dressed down by angry voters. Iraq is as big a mess now as We obviously did not fix that one. Reporter: The president had canceled plans to travel to california next week. Instead, he will stay in washington and try to convince congress to pass that resolution authorizing military force. But, george, as you can see, it's a really uphill battle at this point. One thing rnd consideration, is a nationally televised address a on syria. We're learning if a strike occurs about what retaliation might look like from iran. Reporter: Yeah. There are reports that iran is encouraging militants in iraq to attack the u.S. Embassy. The white house has no comment on that specific report. But they are well aware that retaliation is a real possibility. And they tell me they have taken every step to protect u.S. Personnel, especially in the region against these possible retaliatory attacks. Jon karl, thank you very much.
This transcript has been automatically generated and may not be 100% accurate.