The U.S. government will declare the Syrian radical rebel group Jabhat al-Nusra a foreign terrorist organization on Tuesday, according to documents posted on the federal register.

The group will be considered an alias for the already proscribed Al-Qaeda in Iraq group, the notice said.

The group of hardline Islamists, commonly known as the al-Nusra Front includes fighters with experience in the Iraqi insurgency. They have been behind many military successes for Syrian rebels, but also some of their more extreme tactics like suicide bombings.

The goal of the designation is to isolate extremists groups in Syria while giving a boost to the new political opposition group unveiled at a summit in Doha, Qatar, last month, CNN's Security Clearance blog reported last week.

The United States and other western governments had pushed for the formation of a new opposition group that was more representative of people inside Syria, as opposed to a group mostly comprised of Syrian expatriates.