Local Fine Gael TD Frank Feighan has blocked nearly 300 people on social media in the past month because of sectarian and racist abuse.
The Sligo-Leitrim deputy says one of his grandfathers was a commander of the IRA in north Roscommon, and was a Sinn Féin councillor.
He says his other grandfather was from south Armagh, and couldn't go back to Northern Ireland because of his involvement in the War of Independence.
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Speaking during a discussion in the Dáil about Irish unity, Deputy Feighan says he's been abused online recently:
