It should be underlined, though, that the possibilities for foreign interference in US elections is a much bigger phenomenon than simply this sort of organized-crime style arm twisting by a president.
The Republican-majority Supreme Court has gutted campaign finance law and has allowed essentially anonymous money to flood into campaigns. The Roberts court, in striking down McCutcheon v. FEC”> in McCutcheon v. FEC limits on individual spending on campaigns, opened the door to Donald Trump to simply buy the 2016 election. If he had tried to do that in the 1990s he’d have gone to jail just for that infraction.
In addition, since the money is anonymous, it can be foreign. I wrote on this issue earlier,