As the United States winds down its decade-long war in Afghanistan, the two presidential candidates disagree on the pace of the U.S. withdrawal.

Both Republican candidate Mitt Romney and President Obama have had to make tough and at times controversial decisions with regard to homeland security and counterterrorism.

Backgrounder: U.S. debate over treatment of detainees hinges on interpretation of the Geneva Conventions.

The presidential candidates generally agree on support for democracy and human rights in Arab states, but have differed on several policy particulars, such as military intervention in Libya and Syria.

Backgrounder: The financial levers Washington is applying to bring about a suspension of Iran’s nuclear program.