Gerry Adams

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Britain's Prince Charles. left, shakes hands with Sinn Fein president Gerry Adams at the National University of Ireland in Galway, Ireland, Tuesday May 19, 2015. (Brian Lawless/Pool photo via AP)

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Sinn Fein president Gerry Adams smiles toward supporters as Martin McGuinness looks on during a party rally in West Belfast, Northern Ireland, Monday, May, 5 2014. Adams walked free Sunday after five days of police interrogation and declared his innocence in the unsolved 1972 abduction, slaying and secret burial of a Belfast mother of 10, Jean McConville. (AP Photo/Peter Morrison)

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Sinn Fein President Gerry Adams gets a warm welcome from a woman on the Andersonstown road in West Belfast, Northern Ireland, Monday, May 5, 2014. A police evidence file documenting Gerry Adams' Irish Republican Army career has been delivered to British state prosecutors in Belfast, but experts say the chances of the Sinn Fein leader being charged are slim on legal, political and particularly national-security grounds. Adams, 65, walked free Sunday after five days of police interrogation and declared his innocence in the unsolved 1972 abduction, slaying and secret burial of a Belfast mother of 10, Jean McConville. (AP Photo/Peter Morrison)

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Sinn Fein party leader Gerry Adams speaks to the media in West Belfast, Northern Ireland, Sunday May 4, 2014. Adams was released without charge Sunday after five days of police questioning over his alleged involvement in a decades-old Irish Republican Army killing, an event that has driven a dangerous wedge into Northern Ireland's unity government. (AP Photo/Peter Morrison)

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Sinn Fein party leader Gerry Adams speaks to the media in West Belfast, Northern Ireland, Sunday May 4, 2014. Adams was released without charge Sunday after five days of police questioning over his alleged involvement in a decades-old Irish Republican Army killing, an event that has driven a dangerous wedge into Northern Ireland's unity government. (AP Photo/Peter Morrison)

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Sinn Fein party leader Gerry Adams speaks to the media in West Belfast, Northern Ireland, Sunday May 4, 2014. Adams was released without charge Sunday after five days of police questioning over his alleged involvement in a decades-old Irish Republican Army killing, an event that has driven a dangerous wedge into Northern Ireland's unity government. (AP Photo/Peter Morrison)

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Police secure the area around Antrim Police station for the release of Sinn Fein President Gerry Adams, Antrim, Northern Ireland, Sunday, May, 4 2014. Adams was released without charge Sunday after five days of police questioning over his alleged involvement in a decades-old Irish Republican Army killing, an event that has driven a dangerous wedge into Northern Ireland's unity government. (AP Photo/Peter Morrison)

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Sinn Fein party leader Gerry Adams speaks to the media in West Belfast, Northern Ireland, Sunday May 4, 2014. Adams was released without charge Sunday after five days of police questioning over his alleged involvement in a decades-old Irish Republican Army killing, an event that has driven a dangerous wedge into Northern Ireland's unity government. (AP Photo/Peter Morrison)