Taoiseach Micheál Martin has contacted British Prime Minister Boris Johnson, calling for the UK government to hold a full public inquiry into the murder of civil rights lawyer Pat Finucane.

John Finucane, the son of the late Pat Finucane, said today that Mr Martin had engaged with Mr Johnson on the matter since the Finucane family met the Taoiseach earlier this week.

He was speaking at the Joint Committee on the Implementation of the Good Friday Agreement.

John Finucane, an MP for Belfast North, along with his mother Geraldine met Mr Martin on Monday for the first time.

"He didn't need us to explain to him the significance and importance and the need for an inquiry into the murder of my father, and he committed to and I understand has already engaged with Boris Johnson on this issue," Mr Finucane said.

John Finucane speaking to media after addressing the committee today

Mr Martin told the Dáil on Tuesday that the Finucane family has the "full weight" of the Government behind their endeavour to seek justice for Mr Finucane's killing.

He also said he would be making his position clear to the UK Prime Minister Boris Johnson ahead of the court deadline of November 30 for the British Government to respond to a UK Supreme Court ruling made last year.

Pat Finucane, 39, was shot by loyalist paramilitaries in front of his family in 1989 amid claims of collusion with state security forces.

In February last year, the British Supreme Court ruled that investigations into the fatal shooting of the solicitor have not been effective and fell short of international human rights standards.

Northern Ireland Secretary Brandon Lewis has indicated that a decision over how the UK government will proceed will be announced.

The Taoiseach met Mr Finucane's widow Geraldine and son John at Government Buildings in Dublin on Monday and gave them his assurance he would push the British Government for an inquiry to be held.