The US Special Envoy to Northern Ireland, Mick Mulvaney, is expected to make his first visit to Ireland, as Envoy, next week.
In March, the US President Donald Trump announced that he was appointing Mr Mulvaney to the role. At the time he was the acting White House Chief of Staff.
He was sworn-in as Northern Ireland Envoy in May and had hoped to visit Ireland and the UK over the summer but was unable to do so because of coronavirus restrictions.
RTÉ News understands that plans are being made for Mr Mulvaney to arrive in Ireland early next week with meetings scheduled in Dublin, Belfast and London over the following days.
Last week, he warned against creating a "hard border by accident" on the island of Ireland following efforts by the UK government to amend parts of the Brexit Withdrawal Agreement.
"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 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 were made 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.