Sen. David Vitter's (R-La.) former aide traveled at taxpayers' expense to court appearances in Louisiana.

Records show Vitter's office covered the expenses of Brent Furer to travel to Louisiana on trips coinciding with "court-related activities" involving the aide's most recent DWI arrest.

The dates of the trips in 2007 and 2008 match times Furer was scheduled to make appearances related to his Dec. 28, 2004, arrest for driving while intoxicated and other related charges, according to records unearthed by the Baton Rouge Advocate.

Furer left Vitter's staff in June after ABC News reported he'd been arrested for allegedly assaulting a female friend with a knife and threatening to kill her. He later pleaded guilty to lesser charges.

A Vitter spokesman said the senator "certainly doesn't condone any questionable timing of these trips."

"The senator did not know about any Baton Rouge DWI incident until it was reported in the press just this past June. ... It is standard for our Washington legislative staff to visit Louisiana periodically for meetings," the Vitter spokesman said.

It's unclear if this latest revelation about Furer will cause Vitter any political harm as he faces a challenge from Chet Traylor, a former Louisiana Supreme Court justice, for the Republican Senate nomination.

Traylor recently released a tough radio ad that hits Vitter for employing Furer. Listen to it below.