Brownback blocking anti-pimping legislation?

In light of Monday’s conviction of Marlin Williams in Sedgwick County’s first case of human trafficking, in which Williams took a 15-year-old girl from Wichita to Dallas to work as a prostitute, the latest New York Times column by Nicholas Kristof on the global issue of sex trafficking caught our eye. Especially this part of it: “A bill to strengthen federal anti-trafficking efforts within the U.S. was overwhelmingly passed by the House of Representatives, led by Carolyn Maloney, Democrat of New York. But crucial provisions to crack down on pimping are being blocked in the Senate in part by Sens. Sam Brownback and Joe Biden, who consider the House provisions unnecessary and problematic.”