Lower-level cabinet member Tom Kirkman becomes President of the United States after a catastrophic attack on the U.S. Capitol. Kirkman must keep the country and his family safe while leading the search for the those responsible for the attack.

Hours after the attack on the Capitol, President Kirkman steps into his role as Commander-in-Chief in the midst of chaos and confusion. Facing dangerous new challenges and adversaries, Kirkman struggles to hold a country together that is on the brink of falling apart.

President Kirkman and his staff work to keep a high-level security breach of the White House a secret just as he’s about to give his first television interview. The FBI continues to investigate the Capitol bombing but Agent Hannah Wells starts to develop her own theories about who was really behind the attack.

When an American track-and-field coach heads to Russia, President Kirkman is thrust into a hostage exchange involving the CIA and the Russian government. Agent Hannah Wells and Deputy Director Atwood's investigation into the Capitol bombing uncovers information that puts Atwood and his family's life at risk.

Circles must tighten as a new discovery within the conspiracy emerges. Tension rises between Aaron and Emily as suspicions loom in the White House. A new lead places Agent Wells closer than before to the truth.

An investigative journalist shocks the White House when he reveals classified information during a press briefing and leaves Seth struggling to contain the damage from the leaked story. Hannah unearths a key connection between MacLeish and the conspiracy.

As President Kirkman releases an agenda to reset his presidency, Alex makes a controversial public statement that threatens to derail it. Agent Wells unknowingly finds herself in the center of a dangerous trap while getting closer to the truth.

As President Kirkman considers candidates for Vice President, Kimble Hookstraten finds herself embroiled in scandal. Agent Wells and Jason Atwood return from North Dakota with a critical new lead while journalist Abe Leonard's investigation takes an unexpected turn.

In the nail-biting season finale, Hannah Wells must stop the conspiracy from carrying out a final attack while President Kirkman authorizes a nationwide manhunt for the mastermind behind it all.

FBI Agent Hannah Wells finally closes in on Patrick Lloyd, but when the president decides to take action during the White House Correspondents Dinner, members of the Homeland Security Council threaten to derail their plans.

Tensions rise between America and Mexico when a Mexican citizen is shot during a border dispute regarding Mexican trade imports. Kirkman and his staff must work quickly to resolve the situation and create a new trade deal.

It’s been ten weeks since his wife, Alex, was killed in a car accident; and President Kirkman’s senior staff insist he seek professional help in dealing with his loss, forcing him to reluctantly see therapist Dr. Adam Louden. Meanwhile, FBI Agent Hannah Wells and Aaron Shore travel to Cuba as part of a trade delegation, but the trip does not go according to plan. With lives in the balance, Kirkman is challenged with a decision that will test his role as commander in chief during this time of personal tragedy.

When a missile intended to bring water to stranded astronauts in space is hacked, President Kirkman must work with Russia and enlists the help of Dr. Andrea Frost to help save lives and find out who is behind the hack. Meanwhile, Hannah finds herself working with Damian again.

As more content from President Kirkman’s confidential therapy sessions continues to leak out, Vice President Darby meets secretly with the entire Cabinet, resulting in attorney Ethan West looking into the president’s past – while playing a large role in his future as commander in chief

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.