The Texas Supreme Court has ruled that lawmakers cannot stop executions through a legislative subpoena after the execution of Robert Roberson was delayed last month.

The Texas Supreme Court on Friday said the execution of a man convicted of murder in the 2002 death of his 2-year-old daughter could move forward, even as a state house committee seeks to subpoena the man for his testimony and its bipartisan members fight to spare his life.

Texas lawmakers exceeded their power when they intervened last month to stop the execution of Robert Roberson by summoning him to testify, the court found.