’d say, based on this polling, that Trump is probably well-situated to repeat that vote total again in 2020, or get pretty close to it. He may be polling under his 2016 vote total, but remember when you go to the ballot box there is no “undecided” option. And in a Republican state like North Dakota, Trump probably gets most of the undecideds.
Also, voters behave differently in the heat of campaign season.
It wouldn’t surprise me to see Trump come in somewhat under his 2016 total, if only because Joe Biden almost has to out-perform Hillary Clinton among North Dakota voters.
It would be very difficult to do worse. Again, North Dakota is a deeply Republican state. As long as Trump keeps Republicans happy, and breaks even with independents, he’ll win the state easily.
President Donald Trump job approval:
President Donald Trump vs. former VP Joe Biden: 59/39