Unfortunately, Donald isn't mentally altogether.
Robert Barnes a former Trump lawyer and others have spoken about his mental decline and confabulation, a type of memory disruption that leads to inaccurate, distorted, or even fabricated memories(e.g. negotiating with an Iranian that wants a deal).
Sadly, watching the Military movement in the region, there will likely be a big maneuver against Iran in the next 72 hours and Iran will respond accordingly.
In terms of negotiations, Trump’s actions have closed that path. Looking at Iranians in Iran, they're increasingly carrying the red flag of revenge, they don't want to negotiate, even Pezeskhian was booed during Khamenei's funeral. Remember the revolution against the Shah was started by students, who also stormed the American embassy and took hostages.
There's that same air in Iran today especially in the young. By their actions (bombing schools, hospitals and infrastructure) all Trump and Netanyahu did was "prove" that the hardliners were right about the West being evil and ensured that any Iranian official that signs a deal right now would be in danger.