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

As NPR noted, “The longest filibuster on record was a 1957 speech by then-Democratic Sen. Strom Thurmond of South Carolina — in opposition to the Civil Rights Act — that lasted for 24 hours and 18 minutes.” Technically, Booker’s speech was not a filibuster since the Senate wasn’t holding a debate over a specific bill or nominee.