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

U.S. Sen. Cory Booker (D-N.J.) pledges to hold the Senate floor for "as long as I'm physically able" in a filibuster that began on Monday night. Booker is protesting what he called a reckless and unconstitutional attack on America by President Donald Trump. (Photo by congress.gov via Getty Images) Getty Images