In not-Trump news...

I'm guessing there'll be an investigation (probably already going on) and ensuing accusations of foul play, even though they were flying in heavy fog in the mountains.

Iran owns a number of helicopters but international sanctions make it difficult to obtain parts for them. Most of its military air fleet predates the 1979 Islamic Revolution.

[...]

The country’s supreme leader, Ayatollah Ali Khamenei – who holds ultimate power with a final say on foreign policy and Iran’s nuclear programme – said the country’s first vice-president, Mohammad Mokhber, would take over as interim president. The deputy foreign minister, Ali Bagheri Kani, was appointed as acting foreign minister.

“I announce five days of public mourning and offer my condolences to the dear people of Iran,” Khamenei said. Mokhber, like Raisi, is seen as close to Khamenei.

Under Iran’s constitution, a new presidential election must be held within 50 days.

  Guardian

Not sure whether the president does anything without the approval or not at the behest of the "Supreme Leader".

Raisi was a hardliner who formerly led the country’s judiciary. He was viewed as a protege of Khamenei, and some analysts had suggested that he could replace the 85-year-old leader.

He won Iran’s 2021 presidential election, for which the turnout was the lowest in the Islamic Republic’s history. Raisi was under sanctions by the US in part over his involvement in the mass execution of thousands of political prisoners in 1988 at the end of the Iran-Iraq war.

Under Raisi, Iran enriched uranium at nearly weapons-grade levels and hampered international inspections. Iran has supplied arms to Russia in its war on Ukraine, and launched a substantial drone and missile attack on Israel. It continues to arm proxy groups in the Middle East, such as the Houthi rebels and Hezbollah.

Mass protests in the country have raged for years.

As have murderous crackdowns.