I had a large binder of materials to help me get through my points, but although I sometimes read an op-ed or prepared remarks in between my thoughts, most of my filibuster was off the top of my head and straight from my heart. From 1 to 2 p.m., I barely looked at my notes. I wanted to make sure that I touched every point and fully explained why I was demanding more information from the White House. …

The Senate has the power to restrain the executive branch — and my filibuster was the beginning of the fight to restore a healthy balance of powers. The president still needs to definitively say that the United States will not kill American noncombatants. The Constitution’s Fifth Amendment applies to all Americans; there are no exceptions.

The outpouring of support for my filibuster has been overwhelming and heartening. My office has fielded thousands of calls. Millions have followed this debate on TV, Twitter and Facebook. On Thursday, the White House produced another letter explaining its position on drone strikes. But the administration took too long, and parsed too many words and phrases, to instill confidence in its willingness or ability to protect our liberty.