The Fine Gael leader has said he is not sure if he would allow his party candidate John McGahon to canvass with him if he travelled to Louth.
Mr McGahon was found not guilty in a trial in 2022 for physically attacking Breen White outside a Co Louth pub.
While Mr McGahon was acquitted in a criminal trial, he was found 65% liable for damages in a subsequent civil trial and the High Court jury ordered Mr McGahon to pay €39,000.
Speaking at an election event today, Simon Harris said he would need to reflect if he would canvass with Mr McGahon.
"I have made very clear my view in relation to violence and I'd need to reflect on that," he said.
Speaking later to RTÉ's Six One, Mr Harris said: "There are two candidates selected to run for Fine Gael in Louth. I'm asking people to vote Fine Gael in Louth."
Separately, Mr Harris said he is taking a "project truth" approach to calling out Sinn Féin's spending pledges as fears over future economic threats took centre stage in the General Election campaign.
He argued Ireland and other EU countries need to prepare for the possibility of trade shocks as he criticised the scale of Sinn Féin's spending pledges as well as their saving plans.
He said: "I think that is irresponsible, I think it is dangerous and I think it is reckless."
He accused Sinn Féin leader Mary Lou McDonald of not being able to say what her party was prepared to do in the event of an economic crash, adding that Fine Gael would borrow and stop putting money towards a rainy-day fund.
Meanwhile, other party leaders out on the campaign trail hammered home their messages as they jockey to maximise their chances of forming the next government before polling day.
Ms McDonald expressed scepticism over Fianna Fáil leader Micheál Martin's continued insistence that his party will not go into government with hers.
She said that Mr Martin had been categoric about such issues in the past, only to go into coalition with Fine Gael.
At a party meeting, Mr Martin declared that Fianna Fáil has ensured that the country has enough reserves to pay public servants and maintain public services should there be any future economic challenges.
Meanwhile the leader of the Green Party urged voters against what he termed "sleepwalking" into a "conservative government".
Roderic O'Gorman claimed that "right-wing independents" and "populist parties" could row back on progressive policies.
He said that Fianna Fáil and Fine Gael "want a coalition partner that represents the path of least resistance".
The Labour Party accused Fine Gael of mounting an "operation fear" on the economy and dismissed the gambit as lacking any credibility.
The greatest threat to the country's economic stability was the return of the current administration, finance spokesperson Ged Nash asserted.
Labour Party leader Ivana Bacik again insisted that the only way to bring about change was for centre-left parties to form a bloc in any government formation talks.
Social Democrats deputy leader Cian O'Callaghan warned that Ireland cannot afford a continuation of the Government's failed housing policy for the next five years, given that the average house price has surged to €345,000 during the Coalition's time in office.
"We certainly will talk to other parties and see where we can get common ground," he said at the party's final press conference of the campaign.
"We especially want to talk to any other parties that are supportive of the five areas that we've outlined to see how we get them to support our five deal-breakers."
Those include guaranteeing the delivery of 50,000 affordable purchase homes and the full implementation of Sláintecare.
Meanwhile, the latest Business Post RED C opinion poll suggests Fianna Fáil holds the most slender of leads over Fine Gael and Sinn Féin heading into Friday.
The online survey of 1,004 voters taken over six days up to yesterday, indicates that Fianna Fáil is unchanged at 21% on a previous poll conducted just over two weeks ago.
Fine Gael drops two points to stand at 20%, while Sinn Féin is up two points to also stand at 20%.
