Honolulu Deputy Prosecutor Jon Riki Karamatsu was arrested on suspicion of operating a vehicle under the influence and refusing to submit to a breath, blood or urine test early Saturday morning in Waikiki.

Karamatsu, 40, a former state legislator, was stopped at Ala Moana Boulevard near Hobron Lane around 1:33 a.m.

This is the second time Karamatsu has faced legal problems for allegedly driving under the influence.

Karamatsu was arrested for drunken driving in 2007 after he lost control of his car and struck a concrete pillar at the Ahua Street overpass. A Breathalyzer measured his blood-alcohol content at 0.171, more than twice the legal limit.

Then a state representative for Waipahu, Village Park and Waikele, Karamatsu pleaded no contest to the charge and sentenced to 72 hours of court-ordered community service and a $750 fine. As a result of the incident, Karamatsu stepped down from his post as House vice speaker.

Karamatsu joined the prosecutor’s office in 2010 following a failed bid for the office of lieutenant governor.

"We’re extremely disappointed," said Dave Koga, spokesman for the prosecutor’s office. "At this point, we need to wait until all the facts are in before deciding how to move forward."

Karamatsu’s case will likely be handled by the Attorney General’s Office, Koga said.