The mother of slain State Department employee Sean Smith has endorsed Republicans’ call for a select committee to investigate last year’s attack on the U.S. mission in Benghazi.

In a letter to Rep. Frank Wolf (R-Va.), Patricia Smith wrote that her son and the three other Americans killed on Sept. 11, 2012 — including Ambassador Christopher Stevens — were “abandoned” by the White House. Wolf is the sponsor of H. Res. 36, which has 89 co-sponsors.

“Please, Please help me find out who is responsible and fix it so no more of our sons & daughters are abandoned by the country they love,” Smith wrote.

Smith was an IT officer at the U.S. mission, according to the State Department. Hours before the attack, he posted a message on a gaming forum saying the installation appeared to be under surveillance.

“Assuming we don’t die tonight,” he said. “We saw one of our ‘police’ that guard the compound taking pictures.”