Ben Jealous, who joined the environmental group in 2023, has clashed with some employees and the organization’s union.

© Craig Hudson for The New York Times

The announcement could have a significant impact on the race for U.S. Senate in Texas. Mr. Paxton is challenging Senator John Cornyn in the Republican primary.

© Desiree Rios for The New York Times

The announcement could have a significant impact on the race for U.S. Senate in Texas. Mr. Paxton is challenging Senator John Cornyn in the Republican primary.

© Desiree Rios for The New York Times