Harper actually was a good PM. If he was there now he’d work with Trump.
If Harper was still PM, yes he’d work with Trump, he’d be in a meeting with a notebook, a cup of coffee and after they’d sorted out a deal they would tell their negotiation team to transcribe the notes and go home.
After the meeting with Trump and Harper, the two of the would go to a hockey game and argue about a crosscheck.
The entire negotiations would take about 3 hours.