Federal judges scrutinized Alabama's revised congressional map, doubting compliance with a second-majority Black district.
A panel deliberated the map's validity but didn't reveal their ruling.
U.S. Supreme Court mandated redistricting due to Voting Rights Act concerns.
Plaintiffs alleged new map still discriminates; judges questioned Alabama's adherence.
Republican-led Alabama faces accusations of defying court directives for fair representation.
High-stakes hearing in Birmingham draws attention; equity for Black voters sought.