The New Jersey senator saw significant changes in his heart rate, stress score and movement throughout his historic speech.

First off, it was not a filibuster. But Booker's historic 25-hour speech broke the Senate record, and was a startling challenge to Trump’s agenda

He surpassed a record segregationist Strom Thurmond set in 1957, getting millions of views and widespread acclaim from Democrats as a model for how to take on Trump.