"We have proof," he said of al-Nusra's chemical weapons use.
The United States has designated the front as a terrorist group. But al-Zoubi finds it hypocritical that while the United States talks about fighting terrorism, "in reality it doesn't seem to be doing so." That's because, he said, Washington is more intent on accusing the Syrian government than on seeking the truth.
"America is not serious about discussing this type of chemical weapons use," al-Zoubi said. "It is shameful."
The United States says it is sending the opposition nonlethal material, not arms. But al-Zoubi has a different take on that.
"There seems to be a question as to the position of the United States toward Jabhat al-Nusra and al Qaeda. America talks about fighting terrorism, but in reality it doesn't seem to be doing so. How can you fight terrorism and count Jabhat al-Nusra as a terrorist organization and at the same time send weapons to these terrorists?"
He maintained that the government is "very sure" that chemical weapons in Syria were brought there from Turkey.
He said that he's not an expert on what chemical weapons are being used but that such a question should be asked of the leaders of Turkey and Qatar, because they are sending weapons to al-Nusra and al Qaeda. He said pressure on the Assad regime has been an obstacle to a fair U.N. investigation of the use of chemical weapons.
"If the United States wants to prove anything, they need to show the evidence to us. We are very sure that these weapons have come to Syria from Turkey. This is not a political accusation. This is based on facts. And Jabhat al-Nusra has said that this is true. There are videos that make this clear," al-Zoubi said.
A Turkish diplomatic source "firmly denied" Syria's "baseless allegations" about chemical weapons and said its comments "cannot be taken seriously" because the regime is obstructing a U.N. fact-finding mission on the issue.
Al-Zoubi says he wonders why Western nations are giving such weapons to al Qaeda and the al Nusra Front.
"Do they want to increase terrorism, or do they want to find a pretext to invade Syria? If they are trying to make them stronger, it means that the Western countries are on the same side as the terrorists," he said. "It is very clear that the United States, France and Turkey have a one-sided way of looking at this."