Did the US know beforehand about the targeting of Iran's nuclear chief?

The killing of Iran's nuclear programme director has all the hallmarks of one organisation. An organisation which has carried out extra-judicial hits aganst its country's enemies for decades. Mossad. Iran is seen by Israel as an existential threat to its existence. And the recent acceleration of the uranium-enrichment programme, under the supervision of Mohsen Fakhrizadah, the Iranian scientist heading the whole project, will have been viewed by Tel Aviv as a sign of progressive danger. Preemptive action to meet a threat and remove it before it becomes undefeatable is a military concept that has been justified on numerous occasions in the past. The US-lead invasion of Iraq in 2003 was justified on the basis that Saddam Hussein had nuclear, chemical and biological weapons which threatened the region and the world. It turned out to be preemptive action based on false intelligence but the initial argument for action was reasonable, had the intelligence been accurate. The bombing of Serb forces in Kosovo was justified by the West to prevent a humanitarian crisis. The US killing by armed drone in January of Iran's Major-General Qasem Soleimani, head of the Islamic Revolutionary Guard Corps Quds Force, was justified because there was intelligence that he planned further attacks on American forces in the region. Fakhrizadah was not the first Iranian nuclear scientist to be killed, but he was the top man, the founder and father of Iran's nuclear programme. If it was Mossad then I have no doubt that the argument in Tel Aviv would have involved similar language to the argument presented by the US and UK and others for ridding Iraq of its weapons of mass destruction before they could be used in anger. But the timing of this hit has more to do with US/Israel politics than it does about the state of Iran's nuclear programme. In 53 days Joe Biden will be president of the United States and it is difficult to believe that he would sanction such an operation were the Israelis to ask before striking. Israel has always said it will take the necessary action against its enemies - whether the US approves or not. But Tel Aviv will always take Washington and the US president into account when planning an overseas operation like this whether it asks for approval/support or not. So, on the basis that Biden might have disapproved very strongly, the best time to carry out this mission was while Donald Trump was in power. Ergo, that's why it has happened now. So if it was Mossad, did Binyamin Netanyahu tell Trump beforehand? Well, it cannot be a coincidence that on Sunday, six days ago, Bibi Netanyahu (reportedly), Yossi Cohen, the director of Mossad, Mike Pompeo, US secretary of state, and Crown Prince Mohammad bin Salman, the de facto leader of Saudi Arabia, met up in a Saudi city on the Red Sea coast. Was that when Israel informed the US that an assassination was imminent? Would Pompeo have raised any objections? It seems doubtful.