MICK Mulvaney will next week make his first visit to Ireland since assuming the role of US Special Envoy to the north.
Mr Mulvanay was appointed to the envoy's role by President Trump in March, having been acting White House chief of staff at the time.
He visited Belfast in February ahead of his appointment but coronavirus restictions prevented the former South Carolina Congressman returning sooner.
It is understood he will arrive in Ireland early next week for scheduled meetings in Dublin, Belfast and London over the following days.
Last week, he warned against creating a "hard border by accident" following efforts by the British government to override elements of the Brexit Withdrawal Agreement through the UK Internal Market Bill.
"The Trump administration, State Department and the US Congress would all be aligned in the desire to see the Good Friday Agreement preserved to see the lack of a border maintained," Mr Mulvaney said in an interview with the Financial Times.
His remarks came just days after the Democratic presidential candidate Joe Biden warned that the Good Friday Agreement could not be allowed to become a casualty of Brexit.
"Any trade deal between the US and UK must be contingent upon respect for the Agreement and preventing the return of a hard border. Period." Mr Biden tweeted.
Similar warnings have been sounded recently by senior Democrats in Congress including the Speaker of the House Nancy Pelosi and the Chairman of the House Ways and Means Committee Congressman Richard Neal.