For the second time in three years, a National Security Agency contractor is accused of stealing information from the secretive government agency. This time it's a 51-year-old Maryland man who was arrested for allegedly stealing classified computer code that hack foreign governments. But three years ago it was the 29-year-old Edward Snowden who took thousands of documents on NSA surveillance.

Gwen Ifill and the panel talk to voters of the Badger State less than 24 hours after the PBS Newshour Democratic Presidential Debate between HIllary Clinton and Sen. Bernie Sanders. Voters asked the panel about the tone of the 2016 campaign, a lack of substance from the candidates and a potential Bernie Sanders-Donald Trump-Michael Bloomberg match-up in the general election.

Congress passed the USA Freedom Act which overhauls the way U.S. intelligence agencies can monitor phone records. Meanwhile, nearly 4 million federal government had personal information stolen in a widespread attack U.S. officials are blaming on China. On the 2016 campaign trail, four new candidates threw their hats in the ring this week.

As Congress debates portions of the PATRIOT Act that expired this week, we look back in the Washington Week Vault to the day President George W. Bush signed the bill into law in 2001. The nation, just weeks after the September 11 attacks, was looking for information to track down the terrorists responsible for the attack.

For the first time in nearly 14 years, the National Security Agency is no longer allowed to log every time an American picks up the telephone to call someone. Overnight, three key provisions of the Patriot Act were allowed by the Senate to expire, despite exhortations by the White House. Gwen Ifill talks to Charlie Savage of The New York Times about what happens now.

Gwen Ifill talks to Amy Walter of the Cook Political Report and Tamara Keith of NPR about the 2016 campaign launches of former Gov. Martin O’Malley and Sen. Lindsey Graham, why Sen. Rand Paul took a stand on the Patriot Act, and remembering Beau Biden, son of Vice President Joe Biden, who died over the weekend at the age of 46.

Islamic State forces made significant gains in Iraq and Syria this wee. With ISIS controlling half of Syria, Yochi Dreazen of Foreign Policy reports on the U.S. efforts to fight back. Back home, Congress prepares to leave town for Memorial Day while continuing fights on contentious bills including fast-track trade authority and reauthorization of NSA data collection. Plus the 2016 race heats up.

A federal appeals court ruled hat the NSA bulk collection of telephone call information is illegal. The court said that information can only be gathered when there is something specific to investigate.

The government program that collects the phone data of millions of Americans is illegal and not sanctioned by the Patriot Act, according to a ruling by a U.S. appeals court. Gwen Ifill discusses the case with former Homeland Security Department official Stewart Baker and Kate Martin of the Center for National Security Studies.

The Fallout from the NSA collecting phone records and Internet data. Also, Obama announced the appointment of Susan Rice as his new national security adviser and Samantha Power to succeed Rice at the United Nations.  Plus, Congress tackles the growing problem of military sexual assaults. Joining Gwen: Martha Raddatz of ABC News,  David Sanger of The New York Times; Pete Williams of NBC News.