MINEOLA - Democratic lawmakers want a full investigation into the resignation of former Nassau Police Commissioner Thomas Dale over alleged misconduct.

Late last week, Dale was ousted after prosecutors found he ordered officers to arrest a witness in a politically charged case.

Democrat leaders held a news conference today demanding a full investigation by the U.S. Attorney’s Office and legislative hearings to find out exactly what happened. They also want to know what Nassau County Executive Ed Mangano knew about the incident.

Nassau DA Kathleen Rice found that Dale had personally directed Nassau police officers to arrest a Roosevelt resident who was a witness in a civil case regarding alleged election fraud in the race for county executive.

Rice called Dale's actions unusual, but not criminal. She said there's no evidence to suggest County Executive Ed Mangano was aware of what Dale did.

“It's naive to think that Mangano and his administration didn't know what was going on,” said Legislator Dave Denenberg (D – Merrick). “It's also naive to think that there isn't outside political influence on the police department.”

In a statement, a spokesman for County Executive Ed Mangano said "We will have no response to those who now seek to engage in cheap partisan politics. The findings of the district attorney are quite clear on this matter.”

The presiding officer in the Legislature told News 12 that the next order of business will be to confirm a new police commissioner.

For extended video on news conference, watch the clip to the left or click News 12 Extra on Optimum TV channel 612.