One UK official alone can call the vote.

That discretion, not Trump’s opinion, decides Northern Ireland’s constitutional future.

The Good Friday Agreement requires the Secretary of State to judge a majority likely, a test never defined.

Any unification vote needs a second, concurrent referendum in the Republic of Ireland.

How each outlet framed it

drawn from 1100+ reports worldwide

The Guardian
captures Trump's casual confidence ('one of the naturals of all time') and dismissal of British objections
RT
frames Irish unification as historically inevitable and suggests Trump can accelerate the timeline
Al Jazeera Online
emphasizes Burnham's stated opposition and lack of Irish government endorsement for Trump's position
Dawn leans favorable

Sources: The Guardian, RT, Al Jazeera Online, Dawn