Patricia Smith, whose son was killed during the terrorist attack on the U.S. Consulate in Benghazi, Libya, says that President Obama and then-Secretary of State Hillary Clinton broke their promise to her to find out how her son died.

“When I was in Wash. DC at the reception of the caskets, I asked for and received promises from Pres. Obama, Hillary Clinton, Leon Panetta, VP Biden and several other dignitaries in attendance,” Smith wrote in a letter to Rep. Frank Wolf, R-Va. “They all looked me directly in the eyes and promised they would find out and let me know. I got only one call from a clerk about a month later quoting from the time line, which I already had.”

Wolf’s office said that Smith wrote him the letter after “unexpectedly” calling Wednesday to discuss his push for a joint select committee to conduct a congressional investigation into the Benghazi attack. In her letter, she endorsed the legislation that would create the committee.

“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 urged. “It is very difficult to find out Leon Panetta advised Pres. Obama that the attack was occurring and Pres. Obama went to bed without sending help. It is too late for my son but not too late for those that follow.”