Chris McDaniel says Scalise is criticized while others get free pass.
The attorneys say McDaniel filed his challenge too late.
Attorney Mitch Tyner and his wife are among 15,000 potential Miss. Senate crossover votes.
"Let’s let the court decide what’s appropriate and fair," Henry Barbour said.
McDaniel will unveil a challenge at a news conference, his campaign confirmed to The Hill.
The Tea Party challenger is continuing his fight against Thad Cochran's win last month.
Tea Party challenger Chris McDaniel says campaign found "8,300 questionable ballots cast."
She said he's “being led down a primrose path to political oblivion.”
GOP hopes of corralling the Texas senator during the 2014 primary season are officially dead.
NRSC vice-chair says conduct of "Washington, D.C., machine ... was incredibly disappointing."
He chided racially charged questions asked during a Cochran press call.
Media call interrupted by apparent McDaniel supporters who asked racially charged questions.
Tea Party candidate would have been “Todd Akin, Richard Mourdock on steroids.”
In first interview since losing runoff to Cochran, McDaniel exudes confidence.
The Tea Party’s much-hyped war on GOP Senate incumbents is officially a bust.
The state Republican Party chairman said the candidate should move his challenge to courts.
The state senator has few options left in challenging the legitimacy of his primary loss.
Club for Growth president says case to challenge Thad Cochran's runoff win isn't clear.
True the Vote declared it has evidence of tampering in runoff records.
The Mississippi senator's campaign will amend $53,000 in get-out-the-vote cash payments.
McDaniel is contesting his loss in the GOP primary runoff election.
"The correct remedy is a new election," Chris McDaniel election lawyer Mitch Tyner said.
Losing Tea Party challenger is pushing forward in his fight over Senate runoff results.
Mississippi attorney Mark Mayfield played a role in the challenge of Sen. Thad Cochran.