A federal appeals court will hold a new hearing on whether a Texas voter ID law has discriminatory effects on minorities ? a potential blow to the Obama administration's efforts to fight new ballot-box restrictions passed by conservative legislatures around the country.

A three-judge panel of the 5th U.S. Circuit Court of Appeals in New Orleans ruled in August that the 2011 Texas law requiring 14.6 million registered voters to show picture identification at the polls violates parts of the federal Voting Rights Act. But an order issued late Wednesday says a majority of the full court, which currently has 15 members, voted to hear the case again.  

The order was issued without additional opinion, and a new hearing date hasn't been set.

Texas was allowed to enforce the voter ID law during elections in 2014 and during last week's primary. Supporters say it prevents fraud, but opponents argue its true intent is to make voting tougher for older, poor and minority voters who tend to support Democrats and are less likely to have the mandated forms of identification.

In a statement, state Attorney General Ken Paxton called the order "a strong step forward in our efforts to defend the state's Voter ID laws."

"We look forward to presenting our case before the full Fifth Circuit," said Paxton, a Republican who has been indicted on felony securities fraud charges stemming from actions he took before becoming attorney general in January 2015.

Conservative and liberal groups are only beginning their battle over the Supreme Court vacancy, with a smattering of television ads and behind-the-scenes research serving as warning shots in what's sure to be an expensive fight that will color November's elections.

Activity will only ramp up once President Barack Obama names someone to replace the late Justice Antonin Scalia ? a nomination Senate Majority Leader Mitch McConnell, R-Ky., and other Republicans promise the chamber will never consider. Many expect Obama to announce his pick next week.

With the court's 4-4 balance between liberal and conservative justices in play, both parties and their allies are reaching out to rally their memberships, solicit contributions and savage the opposition.

The conservative Judicial Crisis Network has run TV spots backing GOP senators in seven states and digital ads targeting Democrats in four others, while its leader wrote an article criticizing one potential nominee for a case she handled as a public defender a decade ago. On its website, the legislative arm of the National Rifle Association links readers to an article titled "Justice Barack Obama?" suggesting that scenario should Democrat Hillary Clinton become president.

The Senate Majority PAC, backing Democrats, has launched a New Hampshire TV ad accusing GOP Sen. Kelly Ayotte, in a competitive re-election race, of "ignoring the Constitution, not doing her job." And Citizens United, dedicated to overturning the Supreme Court decision that unleashed unlimited campaign spending by corporations and unions, has aired commercials pressing Ayotte and Sen. Roy Blunt, R-Mo., to consider a nominee. A group of 21 Democratic attorneys general penned a letter warning Senate leaders not to "undermine the rule of law." MoveOn.org and other progressive groups plan rallies outside senators' home-state offices on a March 21 "National Day of Action."

"A Supreme Court nomination is the No. 1 top priority for almost any conservative group," said Carrie Severino, the Crisis Network's policy director, a sentiment shared by liberals, too. "Almost every issue ultimately finds its way to the Supreme Court."

Democrats and liberals have focused on Senate Judiciary Committee Chairman Charles Grassley, R-Iowa, and other Republican senators seeking re-election this fall in swing states like Ohio, Pennsylvania and Wisconsin. Backed by nearly all GOP senators, Grassley has said his panel won't hold a hearing on Obama's choice.