Tánaiste and Minister for Foreign Affairs Micheál Martin is in Belfast for a number of meetings and events today.
His first engagement was a visit to a Police Service of Northern Ireland station in Belfast city centre.
He spent an hour meeting with rank-and-file officers to convey the Government's solidarity following the attempted murder of Detective Chief Inspector John Caldwell in Omagh, Co Tyrone in February.
The officer remains critically ill after being shot a number of times by two gunmen in an attack by the New IRA dissident republican group.
Mr Martin then met Amnesty International and a number of relatives of victims of the Troubles.
They urged the Tánaiste to give a commitment to take legal action if the British government refused to drop controversial plans to end all investigations and prosecutions into Troubles killings.
Amnesty had repeatedly said the proposed legislation would give the UK licence to let perpetrators get away with murder, torture and other serious crimes committed.
It called for an inter-state challenge to be brought to the European Court of Human Rights and for the Irish Government to indicate publicly that it will take this course of action if the UK government proceeded with the plan.
"This meeting comes at a highly significant time, just ahead of the Good Friday Agreement's 25th anniversary," said Grainne Teggart, Amnesty UK's Northern Ireland Deputy Director.
"The UK government's celebration of the anniversary is tainted with hypocrisy - while praising its achievements, it is pushing through the Troubles Bill which, if passed, will recklessly violate it and undermine a delicate peace settlement."
The planned legislation is opposed by the Irish Government, all political parties and victims' organisations in Northern Ireland, and concerns had been raised by the US Congress and the United Nations.
Mr Martin also addressed business leaders at the Belfast Chamber of Commerce lunch this afternoon.
He is due to meet Northern Secretary Chris Heaton-Harris before they co-host a reception for teachers and pupils from the integrated education sector.
