Sens. Lindsey Graham and Joe Lieberman are expressing concern that Iran is aggressively extending its support for anti-democracy forces wherever they appear.

In appearances on “Fox News Sunday,” Graham, a Republican, says it is important for the United States to push back against Iran’s assistance to the Taliban in Afghanistan, opponents of the government in Iraq and protesters battling the Syrian regime.

Lieberman says Iran has the blood of hundreds of American soldiers on its hands and that legislation in Congress would impose additional economic sanctions on an Iranian government that has murdered its own people.

On a separate issue, Libya, Lieberman criticized the Obama administration, saying it has failed to clearly articulate the U.S. mission there. Lieberman and Graham support a goal of removing Moammar Gadhafi from power.