The First Minister and Deputy First Minister have said they are focused on protecting Northern Ireland following the announcement of US tariffs.
US President Donald Trump implemented a 10% tariff on the UK, which he said was the baseline rate for all countries. The 10% rate is effective from 5 April.
He also announced a 20% tariff on the European Union as part of a slate of international measures on what he deemed "liberation day".
In a statement, First Minister Michelle O'Neill said: "Tonight the US president has announced tariffs for countries across the world.
"In every engagement, both at home and internationally, my priority has always been to protect the best interests of workers, families, and businesses on the island.
"We must ensure that our all-island economy, which has grown substantially in recent years, continues to thrive to create better opportunities for all our people.
"I will continue to speak with political and business leaders throughout this period of uncertainty, always prioritising the prosperity and future of everyone who calls our island home."
Ms O'Neill announced a boycott of engagements in Washington DC to mark St Patrick's Day last month.
Deputy First Minister Emma Little Pengelly, who met Mr Trump at the US Capitol, said the focus shifts to UK-USA negotiations and efforts to ensure the EU response does not impact Northern Ireland.
She said: "My focus will continue to be on doing all I can to champion Northern Ireland.
"This means pushing for all possible action to protect Northern Ireland, especially against any retaliatory tariffs by the EU.
"I have been vociferously raising our NI issues to all involved and will continue to do so.
"Focus now moves to pushing forward the UK-USA arrangements, supporting UK Government to do so and ensuring Northern Ireland is central to these considerations.
"In addition, all efforts to ensure EU tariffs to USA and political decisions at EU level to US do not penalise Northern Ireland business or detrimentally impact on us. Much still to be done."
'Issue' for NI if EU imposes retaliatory tariffs - Benn
Earlier, Northern Ireland Secretary Hilary Benn said "there is an issue in respect to Northern Ireland" if the EU imposes retaliatory tariffs on the US.
Mr Benn told MPs that any impact of tariffs from the US would be "felt equally" across the UK, but if the EU responds with their own tariffs, businesses may have to demonstrate that goods imported from the US are not leaving the UK to have the expenses reimbursed.
European Commission President Ursula von der Leyen has said the EU will negotiate but are also considering retaliating by adding tariffs on US goods.
Post-Brexit, Northern Ireland continues to follow the EU's rules in some areas of trading due to the Windsor Framework arrangement.
Shadow Northern Ireland secretary Alex Burhgart told the Commons: "Later today, we are expecting Washington to announce the biggest changes to its tariff regime in a generation.
"This may cause huge disruption to industry and business throughout the United Kingdom, and that disruption may be particularly felt in Northern Ireland."
Mr Benn replied: "We don't yet know what, apart from the tariff on cars and the tariff on steel and aluminium, what else the US administration may announce later today, but the effects of any tariffs, if they are imposed, will be felt equally in Northern Ireland and across the rest of the United Kingdom.
"We will have to deal with the consequences when we know what the US administration has decided."
SDLP MP Colum Eastwood (Foyle) said investment from US companies in Northern Ireland has been "very important for economic growth and cementing the peace process" in the region as he asked for support to businesses that "could be very detrimentally affected by any potential tariffs".
Mr Benn said "the Government will take the steps that are necessary in the national interest" and are continuing to negotiate a deal with the US.
Additional reporting by PA
