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

New Jersey Democratic Sen. Cory Booker held the Senate floor with a speech that lasted more than 25 hours and broke the record set by Sen. Strom Thurmond of South Carolina, 68 years ago.

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

New Jersey Democratic Sen. Cory Booker held the Senate floor with a marathon speech that lasted 25 hours and 5 minutes, setting the record for the longest continuous Senate floor speech in the chamber’s history on Tuesday night.

Senator Cory Booker's record-breaking speech has stirred presidential speculation, but experts told Newsweek it's too early to know how viable of a candidate he may be in 2028.Newsweek reached out to Booker for comment via his office and political team.

To physically prepare for the feat, Booker used “a lot of tactics,” he said, including fasting and curbing water intake in the days before to make sure he could stand for so long and wouldn’t have to take a bathroom break.

New Jersey Sen. Cory Booker took to the Senate floor Monday evening saying he would remain there as long as he was “physically able.”

The lawmaker who's been holding the Senate floor with a lengthy speech railing against President Donald Trump's Republican agenda is a New Jersey Democrat who once found common ground with the president during his first term.

Frank Luntz said the New Jersey senator’s performance might have even positioned him as the Democratic nominee for president in 2028.