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BELFAST, NORTHERN IRELAND - MARCH 06: Sinn Fein president Gerry Adams (R) and northern leader Michelle O'Neill (L) hold a press conference at Stormont on March 6, 2017 in Belfast, Northern Ireland. Elected MLA's return today after last weeks elections with the two largest parties, Sinn Fein and the Democratic Unionist party commencing talks to form a new power sharing executive government. Sinn Fein northern leader Michelle O'Neill has stated that there can be no agreement if former First Minister Arlene Foster of the DUP is nominated again for the position. (Photo by Charles McQuillan/Getty Images)

BELFAST, NORTHERN IRELAND - MARCH 06: Sinn Fein president Gerry Adams (R) and northern leader Michelle O'Neill (L) hold a press conference at Stormont on March 6, 2017 in Belfast, Northern Ireland. Elected MLA's return today after last weeks elections with the two largest parties, Sinn Fein and the Democratic Unionist party commencing talks to form a new power sharing executive government. Sinn Fein northern leader Michelle O'Neill has stated that there can be no agreement if former First Minister Arlene Foster of the DUP is nominated again for the position. (Photo by Charles McQuillan/Getty Images)
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BELFAST, NORTHERN IRELAND - MARCH 04: Sinn Fein President Gerry Adams (C) and northern leader Michelle O'Neill (3rd L) hold a post election press conference at Sinn Fein headquarters on March 4, 2017 in Belfast, Northern Ireland. Sinn Fein increased their vote significantly in yesterday's Northern Ireland Assembly snap election and for the first time Stormont will not feature a Unionist majority in government. The Democratic Unionist party, who were implicated in the Renewable Heat Incentive scheme scandal suffered a damaging loss but remain the number one party in the province albeit with a slim majority of just one seat. (Photo by Charles McQuillan/Getty Images)

BELFAST, NORTHERN IRELAND - MARCH 04: Sinn Fein President Gerry Adams (C) and northern leader Michelle O'Neill (3rd L) hold a post election press conference at Sinn Fein headquarters on March 4, 2017 in Belfast, Northern Ireland. Sinn Fein increased their vote significantly in yesterday's Northern Ireland Assembly snap election and for the first time Stormont will not feature a Unionist majority in government. The Democratic Unionist party, who were implicated in the Renewable Heat Incentive scheme scandal suffered a damaging loss but remain the number one party in the province albeit with a slim majority of just one seat. (Photo by Charles McQuillan/Getty Images)
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BELFAST, NORTHERN IRELAND - MARCH 06: Sinn Fein president Gerry Adams (C) bows to a group of Japenese tourists as he attends a press call alongside northern leader Michelle O'Neill (2nd L) and Michelle Gildernew (R) at Stormont on March 6, 2017 in Belfast, Northern Ireland. Elected MLA's return today after last weeks elections with the two largest parties, Sinn Fein and the Democratic Unionist party commencing talks to form a new power sharing executive government. Sinn Fein northern leader Michelle O'Neill has stated that there can be no agreement if former First Minister Arlene Foster of the DUP is nominated again for the position. (Photo by Charles McQuillan/Getty Images)

BELFAST, NORTHERN IRELAND - MARCH 06: Sinn Fein president Gerry Adams (C) bows to a group of Japenese tourists as he attends a press call alongside northern leader Michelle O'Neill (2nd L) and Michelle Gildernew (R) at Stormont on March 6, 2017 in Belfast, Northern Ireland. Elected MLA's return today after last weeks elections with the two largest parties, Sinn Fein and the Democratic Unionist party commencing talks to form a new power sharing executive government. Sinn Fein northern leader Michelle O'Neill has stated that there can be no agreement if former First Minister Arlene Foster of the DUP is nominated again for the position. (Photo by Charles McQuillan/Getty Images)
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BELFAST, NORTHERN IRELAND - JANUARY 23: Michelle O'Neill (C) is unveiled as the new Sinn Fein leader in the north at a Stormont announcement press conference alongside Martin McGuinness (R), Sinn Fein President Gerry Adams (L) on January 23, 2017 in Belfast, Northern Ireland. Former Northern Ireland deputy First Minister Martin McGuinness stepped down from his role as Sinn Fein leader in the north recently due to the ongoing Renewable Heat Scheme crisis and also due to ill health. (Photo by Charles McQuillan/Getty Images)

BELFAST, NORTHERN IRELAND - JANUARY 23: Michelle O'Neill (C) is unveiled as the new Sinn Fein leader in the north at a Stormont announcement press conference alongside Martin McGuinness (R), Sinn Fein President Gerry Adams (L) on January 23, 2017 in Belfast, Northern Ireland. Former Northern Ireland deputy First Minister Martin McGuinness stepped down from his role as Sinn Fein leader in the north recently due to the ongoing Renewable Heat Scheme crisis and also due to ill health. (Photo by Charles McQuillan/Getty Images)
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BELFAST, NORTHERN IRELAND - MARCH 06: Sinn Fein president Gerry Adams (R) and northern leader Michelle O'Neill (L) hold a press conference at Stormont on March 6, 2017 in Belfast, Northern Ireland. Elected MLA's return today after last weeks elections with the two largest parties, Sinn Fein and the Democratic Unionist party commencing talks to form a new power sharing executive government. Sinn Fein northern leader Michelle O'Neill has stated that there can be no agreement if former First Minister Arlene Foster of the DUP is nominated again for the position. (Photo by Charles McQuillan/Getty Images)

BELFAST, NORTHERN IRELAND - MARCH 06: Sinn Fein president Gerry Adams (R) and northern leader Michelle O'Neill (L) hold a press conference at Stormont on March 6, 2017 in Belfast, Northern Ireland. Elected MLA's return today after last weeks elections with the two largest parties, Sinn Fein and the Democratic Unionist party commencing talks to form a new power sharing executive government. Sinn Fein northern leader Michelle O'Neill has stated that there can be no agreement if former First Minister Arlene Foster of the DUP is nominated again for the position. (Photo by Charles McQuillan/Getty Images)
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