Despite pleas from the White House and the State Department, as well as an international court order to review their cases, Texas will execute five Mexicans on death row, a spokeswoman for the governor said Thursday. The first of the executions- that of Jose Ernesto Medellin, 33, convicted in the 1993 rape and murder of two teenage girls here- is scheduled for Aug. 5. The decision by Gov. Rick Perry to allow the executions is the latest twist in a long-running battle between Mexico, which has no death penalty, and the United States over the fate of 51 Mexicans facing capital punishment in several states, including 14 in Texas.