Saudi Arabia, whose late King Abdullah once urged the United States to "cut off the head of the snake" by attacking Iran's atomic program, has publicly welcomed a framework nuclear deal with Tehran, but in private mistrust remains deep.
A third of Republicans believe President Barack Obama poses an imminent threat to the United States, outranking concerns about Russian President Vladimir Putin and Syrian President Bashar al-Assad.
Russia is supplying weapons to Damascus under contracts completed since the conflict in Syria began in 2011, as well as under earlier deals, President Bashar al-Assad said.