That's obviously really stupid, but John McCain jokingly sang "bomb bomb bomb Iran" about a decade ago while campaigning.
I don't want to make light of that statement or be pedantic but that's not genocide. I have no idea what Trump thinks he would nuke to target ISIS, but coming from a guy who said he'd make Mexico pay for a wall and at times is incoherent, that strikes me less as a plan and more of the kind of dumb thing he says pretty regularly.
I do believe he has enough of a traditional base around him like Pence to prevent that from happening, but that may be too optimistic.
Still haven't seen anything which suggests he wants to target a race or group of people for eradication, though.
Trump wasn't joking when he was talking about using nukes. And looking at his current senior staff Iran seems to be a reasonable target for hitting ISIS. And if he nukes Iran it is really pedantic to argue if this is a genocide or not.
A tariff, duty, import tax, or whatever you want to call it, is paid by the domestic (US) consumer on the imported good. Out of the price paid by the US consumer for the Mexican product, the sticker price is paid to the Mexican producer, while an extra amount equal to the original price times the tariff rate is paid by the US consumer to the US government.