Testimony will be heard from those in charge of managing rivers as well as emergency managers and first responders about the flash flooding that killed at least 135 people.

Texas lawmakers on Wednesday were set to begin reviewing the July 4 floods that killed at least 135 people, a disaster that put local officials under scrutiny over why residents along the Guadalupe River did not receive more warnings.

Voting on new congressional maps before any response to the Hill Country floods could create a political liability for Republicans, who control all levels of Texas government. Texas is still reeling from the disaster, which is one of the worst in the state’s modern history, and few Texans have voiced concerns about the state’s political maps.