Now running for office for the first time, Kirkman and his nascent campaign stumble out of the gate. Wells gets a critical reassignment.
A heated debate over child marriage roils Kirkman's staff. Opioid addiction hits home for Mars. A biohacker turns Wells onto a chilling new threat.
A political attack on Kirkman puts privacy and transgender rights in the spotlight. Aaron weighs a major decision. Wells and Eli track a bioterrorist.
Aaron's heritage and a widespread teachers' strike become polarizing issues, and Wells discovers a sinister pattern in a flu outbreak.
Emotions run high after despicable fake news goes viral, Isabel makes waves with a controversial appeal, and Wells finds a clue pointing to conspiracy.
A dying Guatemalan child in a Texas hospital brings immigration to the fore. A mugging opens Kirkman's eyes to the realities of life in the capital.
A stray Russian bomber jeopardizes Seattle, Mars crusades against a drug company, and an event from Aaron's childhood vexes Kirkman's campaign.
Kirkman mobilizes a frantic hunt for the bioterrorist. Lorraine plays hardball and pushes the opioid epidemic into the campaign fray.
Trailing in the polls, Kirkman weighs forcing the FBI's hand over the bioterrorism plot. Emily struggles with her mother's final wishes.
On election day, Kirkman turns to his therapist to assuage his conscience about the events -- and his own decisions -- of the momentous prior 36 hours.
A hijacked plane hands Kirkman an international crisis. A White House advisor shakes things up. Wells tracks Lloyd across the globe with a new ally.
A break in the manhunt for Lloyd precipitates a drastic showdown, forcing Kirkman to weigh the law against an imminent threat.
A virulent flu outbreak slips out of control. Tensions erupt over a Confederate monument. Rennett and Wells ferret out damaging new clues.
A deadly incident at the U.S.-Mexico border throws stalled trade negotiations into chaos. The first lady faces questions about a brewing scandal.
Kirkman faces plummeting public trust in the wake of an incendiary off-the-cuff remark. Wells and Rennett probe the murder of a British politician.
The crew of a U.S. warship becomes stranded in hostile waters after colliding with a civilian vessel. Wells and Rennett confront a hostage situation.
Kirkman faces a diplomatic dilemma, lawsuits threaten to consume his family, and Moss stonewalls Wells’s investigation.
During a secret trip to Afghanistan, Kirkman negotiates with influential warlords and Wells comes under fire. Back home, Seth lands in legal trouble.
Kirkman dispatches his staff to investigate a war hero's legacy, a man on death row and a bee colony's collapse. Wells follows a trail of dirty money.
Religious zealots in the path of a raging wildfire square off with the White House over their convictions. Wells digs for the truth behind a betrayal.
While Kirkman struggles to face a staggering loss, Wells and a trade delegation to Havana become a high-stakes bargaining chip for Cuban rebels.
Wells races to find the culprit after a hack on NASA imperils astronauts aboard the space station. Kirkman confronts a trusted but defiant advisor.
Native Americans staging a White House sit-in compel Kirkman to remedy a past mistake. Wells leans on a Russian spy in her hunt for the hackers.
Kirkman clashes with the capital's mayor when a power outage throws the city into chaos. Chuck deciphers a clue buried in the hackers' code.
Emily chases a White House leak that jeopardizes high-stakes peace talks between a rogue nation and its neighbor. A defector begs Wells for help.
On the heels of a historic peace agreement, a dirty bomb smuggled into the country threatens to ignite a war. Wells confronts a baffling double cross.
Waging a retaliatory war against the country behind the dirty bomb, Kirkman sends Wells into the combat zone to negotiate with a rebel leader.
Leaked therapy records precipitate a constitutional crisis that engulfs Kirkman and the White House. Wells, Rennett and Chuck close in on the hackers.
With his presidency in turmoil, Kirkman preps for a hearing on his fitness for office. Wells shares her suspicions about the hacker's identity.
After the murder of a diplomat, Ethan West takes up the cause of a U.S. citizen imprisoned abroad. Kirkman discovers a personal betrayal.
While both parties jockey for Kirkman's allegiance, an old case puts Kendra in the crosshairs. West investigates Moss, who makes a bold announcement.
Kirkman fights to stave off a humanitarian disaster while wrestling to decide his political future. Wells races to protect Rennett's daughter.
When a bomb kills the president and other top politicians, demure Cabinet member Tom Kirkman must suddenly take the reins of a government in chaos.
The day after the bombing, President Kirkman faces down a rogue governor, and a nascent conspiracy forms. The FBI begins its hunt for the bombers.
Wells advances her theory of the bombing after a militant group claims responsibility, and Kirkman gets a taste of cutthroat political maneuvering.
While a strike against Majid Nassar takes shape, treasonous provocations from a governor and military top brass challenge President Kirkman's resolve.
A cryptic clue about the Capitol leads Wells to a jolting discovery, and Kirkman wrestles with ordering a risky SEAL team strike against Majid Nassar.
While Kirkman tries to win over state governors skeptical of his legitimacy, Wells and Atwood squeeze Majid Nassar for the truth about the bombing.
Atwood's suspicions about MacLeish walk a dangerously fine line, and an American hero arrested in Russia sparks an international espionage crisis.
A fresh act of terrorism imperils the country's new elections, Kirkman faces a reckoning with Leo, and Atwood makes a wrenching confession.
Wells's investigation yields damning evidence against a high-placed official, and an NSA whistleblower leads Kirkman to an alarming revelation.
Suspecting a traitor in their midst, Kirkman taps Emily to investigate. Wells zeroes in on her nameless informant and uncovers a critical new threat.
In the aftermath of bloodshed, a conspiracy unfolds and MacLeish makes a daring power play. Wells leaves Ritter a trail of clues to her discovery.
Faced with revelations of treachery, Kirkman lays a snare of his own. Wells chases down a lead and triggers a dramatic turning point.
On the heels of news that shocks the nation, a combative reporter exposes top-secret information and Wells zeroes in on the source of the conspiracy.
Wells turns up a crucial witness to the conspiracy, and a belligerent guerrilla warlord in Africa puts President Kirkman's resolve to the test.
A hot-button issue jeopardizes Kirkman's efforts to move the government out of crisis mode. A fingerprint leads Wells and Atwood into a deadly trap.
Politics and partisanship erode Kirkman's efforts to pass gun legislation, and Wells investigates a shady military contractor in North Dakota.
Political battle lines are drawn over appointing a new Supreme Court. Wells and Atwood dig deeper into the renegade group in North Dakota.
A scandal threatens to sideline Hookstraten, journalist Abe Leonard follows a lead from a mysterious informant, and Wells provokes the conspirators.
Atwood tracks a slippery alt-right leader. Ritter hunts for Wells. As an ethics probe heats up, Hookstraten joins Kirkman to fight for arts education.
An explosive story about the Capitol bombing threatens to subvert Kirkman's first NATO summit agenda. Ritter and Russink lay a trap for the traitor.
While the conspirators make a surprise move, the FBI scrambles to arrest the ringleader. Kirkman asks Aaron to smoke out the White House traitor.