Micheál Martin has called on people to stop demonstrating in an aggressive manner.
The Taoiseach was asked about the crowds that gathered in Dublin on Saturday to protest against restrictions.
Several hundred people protested in Dublin at the weekend and there has also been a small protest in Cork city in recent weeks.
Mr Martin said people had a right to protest in a democracy but he said anyone who was demonstrating in an aggressive manner needed to cease.
"Those who protested last week, it's the aggression of the protest I would have deep concerns about," he said.
"And that should stop. You don't need to get up in people's faces about your opinion, you can have your opinions, you can have your views.
"But there was an aggression on display which I did not like in some quarters last week.
"I have no issue with peaceful protests."