Meanwhile, a U.S. district court in Virginia will hold a last-minute hearing this afternoon to decide whether to halt temporarily the execution of Alfredo Prieto over concerns about the drug Virginia plans to use to execute him. The hearing is a response to an emergency motion filed by his lawyers after they learned Virginia obtained the drug pentobarbital for the execution not from a pharmacy but from the Texas prison system. Prieto, a Salvadoran national, has been convicted of multiple counts of murder. Alfredo Prieto is scheduled to be executed tonight.