The Senate Ethics Committee rejected Tuesday Sen. David VitterDavid Bruce VitterWhere is due process in all the sexual harassment allegations? Not the Senate's job to second-guess Alabama voters The Senate 'ethics' committee is a black hole where allegations die MORE’s (R-La.) demand that the panel investigate Senate Majority Leader Harry ReidHarry Mason ReidDems search for winning playbook Dems face hard choice for State of the Union response The Memo: Immigration battle tests activists’ muscle MORE (D-Nev.) and Sen. Barbara BoxerBarbara Levy BoxerDems face hard choice for State of the Union response Billionaire Steyer to push for Dem House push Billionaire Steyer announces million for Dem House push MORE (D-Calif.).

The Panel said that Vitter’s complaint earlier this month offered no concrete evidence that the two senators or their staff circulated draft legislation in an attempt to dissuade members from voting for a particular piece of legislation sponsored by Vitter.

“The Committee has previously concluded that mere allegations with no evidence or information to support their substantive merit, are insufficient to extend the Committee’s investigative process,” said John Sassaman, chief counsel to the panel in a letter to Vitter.

Vitter had called on Boxer to be recused from any investigation since she heads the panel. A Boxer spokesman said she chose not to be involved in the process.

Vitter’s request came after reports that Democrats were considering embarrassing the Louisiana Republican by bringing up a number of pieces of legislation, including one alluding to his prostitution scandal in 2007. 

Another alleged proposal, which Vitter cited in his complaint, would have withheld healthcare benefits from members who voted for Vitter’s amendment to an energy efficiency bill.

Vitter’s amendment was aimed at forcing lawmakers and their staff to buy health insurance on ObamaCare exchanges without receiving any federal contributions. 

The Ethics panel said it does not typically investigate draft legislation. 

“An inquiry involving speculation over draft legislative language not part of any bill or any proceeding would be unprecedented,” the letter read. 

Vitter and Boxer both head the Environment and Public Works Committee, which oversaw the energy efficiency bill. Earlier this month Vitter had stalled a vote on the energy efficiency bill because he wanted a vote on the healthcare amendment. 

In retaliation, reports leaked that Democrats were considering bringing up the legislative proposals, prompting Vitter’s ethics complaint. 

A Vitter spokesman said the Ethics Committee was shirking its responsibility by not using news reports as evidence and not having Boxer recuse herself.

"Boy, they're really doing their job," the spokesman said in a statement. 

— This post was updated at 8:12 p.m.