By design, the U.S. Senate is a deliberative body in which members have every opportunity to speak their minds on the subject at hand. There are exceptions tied to decorum: Attack or impugn a colleague and the chamber reserves the right to strip speaking privileges from the offending member. On Tuesday night, it did just that to Elizabeth Warren, silencing the Massachusetts senator in the midst of final debate over Alabama Sen. Jeff Sessions, President Trump’s nominee for attorney general.