WASHINGTON (Reuters) - U.S. Senate Republicans blocked a bill titled the Domestic Terrorism Prevention Act in Congress on Thursday that Democrats view as a response to a white supremacist's killing of 10 Black people this month and a potential gateway to a gun control bill. Two days after another mass killing of 19 young children and two teachers at a Texas school, senators voted 47-47 along party lines, short of the 60 senators required to launch debate, to reject the bill authorizing federal agencies to monitor and report jointly on domestic terrorism within the United States, including incidents related to...