The Taoiseach says warning signs surrounding abuse towards politicians 'must be taken seriously'.
In a speech today in Monaghan, Simon Harris is also expected to criticise attacks on Gardaí.
His comments follow revelations yesterday, of a bomb threat which forced the evacuation of Justice Minister Helen McEntee's young family from their home in County Meath during the week.
The Taoiseach is attending a memorial event marking 50 years since the killing of Fine Gael senator, Billy Fox, during The Troubles.
Billy Fox was killed on the night of March 11th 1974 - the only member of the Oireachtas to be murdered during the Troubles.
He'd been visiting his girlfriend's home near Clones when he interrupted an IRA gang searching for guns they'd were wrongly informed were hidden at the property.
The house was burned down, and the 35 year old Senator found shot-dead in a field the next day.
Five members of the Provisional IRA were later convicted over his murder.
Today, a wreath laying ceremony will take place at the Billy Fox Memorial Park in Derrygoony, attended by Taoiseach Simon Harris and Minister Heather Humphreys.
