The CIA knew Tucker was speaking to the Iranian regime. That means that when Trump invited Tucker to the Oval Office multiple times in the lead up to the Iran strike, he knew full well that Tucker was backchanneling information to the Iranians. Essentially Trump seems to have used Tucker as an unwitting counter-intel asset, to convince Khamenei that he was bluffing, that nothing would happen. Trump was basically able to kill Khamenei thanks to Tucker's arrogance. Now Tucker's also legally fucked.