The plot is quickly thickening as Congress continues to investigate a government-run gun smuggling operation that was designed to target criminals but ended up in the gun being used to kill people, including a U.S. Border Patrol agent. What did lawmakers learn in testimony from acting ATF Director Kenneth Melson, which he offered on Monday without informing the Obama administration? Who at the Justice Department may be the next to feel the heat? What do we know for sure about this bungled operation? We ask the man who broke the Melson story, Hans von Spakovsky of Pajamas Media.