US President Donald Trump says he believes his country's ceasefire with Iran is over, responding to a question about the state of the truce following fresh attacks across the Gulf.Whether it means a return to all-out war remains to be seen, given Mr Trump said he would continue speaking with his negotiators Steve Witkoff and Jared Kushner about the next steps.But he labelled the Iranians as "liars", "scum" and "sick people"."They're cuckoo. As far as I'm concerned, it's over," he said."It's just a waste of time dealing with them."It comes after the US military launched fresh strikes against Iranian ships in the Persian Gulf, in response to attacks on tankers in the Strait of Hormuz.ABC/AFP