Stephen Flynn, the SNP's Westminster leader, says people watching the military action taken by the US over the weekend "will have seen many of the hallmarks of Iraq".
But he says the foreign secretary can't seem to say whether the government believes the strikes were legal or not, nor whether MPs would be given a vote about any UK military actions.
He asks David Lammy: "Is he purposely treating the public as fools?"
The foreign secretary quips: "He may just have got his soundbite."
He continues: "On the nuclear question, I'm not going to take lectures from [Flynn], I'm afraid. He's got a very sorry record in relation to that very serious matter."
Lammy adds that the government has been clear that "diplomacy is the way".