Anti Austerity Alliance TD Paul Murphy has claimed that the decision to press ahead with criminal charges against water protesters is politically motivated.
Tánaiste Joan Burton was trapped in her car for more than two hours during anti-water-charge protests in Tallaght last year.
The DPP has reportedly directed that over 20 people are to face various criminal charges in relation to the incident - including violent disorder, false imprisonment, criminal damage and offences under public order legislation.
Deputy Murphy, who was one of those demonstrating in Jobstown on the day last November, says the decision to charge people is an attack on the right to protest.
He also said he is concerned that if he was to be imprisoned as a result of the charges he may lose his Dáil seat.
"It's obviously shocking news," he said.
"Someone rings you up and tells you that it's on the 9 O'clock News that some people will be prosecuted, charged, and then you find out as well that you're likely to be charged with false imprisonment.
"they are serious charges, like I said, so that's concerning.
"[I,] like everybody who faces these charges, would be concerned.
"If I was imprisoned for six months or more, my understanding is that I would automatically lose the Dáil seat - I think people would be outraged by that."