Allison Taylor

Taylor is shown preparing for her Inauguration as the President and preparing to take office after Noah Daniels.

Shortly after Taylor's inauguration, her son, Roger, died under mysterious circumstances. A thorough investigation concluded that Roger, who worked in the private financial sector, committed suicide. She was later informed that Roger had been fingered by the federal government for insider trading, and killed himself shortly before being indicted. According to her chief of staff, a political ally of the President covered it up. While Taylor was able to cope with Roger's death and effectively continued her executive duties, the First Gentleman, Henry Taylor, did not take Roger's death very well, and struggled mightily with its aftermath.

On Day 7, Taylor is preparing to send U.S. troops into Sangala to stop a genocidal campaign by the regime of General Benjamin Juma. During Day 7 as the US is threatened by Iké Dubaku, one of Juma's Colonels, she stands her ground throughout and refuses to withdraw US forces from Sangala despite pressure from her advisers and even after Dubaku uses the CIP device to crash two airliners into each other, inflicting hundreds of casualties. Furthermore, still after her husband Henry Taylor was kidnapped and threatened with execution by Dubaku's men, Taylor refused to order US forces to withdraw from Sangala.

Later after the threat from Dubaku had subsided, General Benjamin Juma lead a team of commandos to attack the White House, taking Taylor and many other White House personnel hostage. Taylor is forced under duress to deliver a live speech via the internet apologising for the US invasion of Sangala, during which Bill Buchanan sacrifices his life as part of the rescue operation which eventually ends the hostage situation against Taylor and the White House.

Taylor later offers her previously estranged daughter, Olivia, a position on her administration as an adviser much to the dismay of Ethan Kanin, Taylor's Chief of Staff. As the events of the day unfold, Ethan Kanin is forced to resign after Jack Bauer is framed for the murders of Senator Mayer and Ryan Burnett, one of the US-based co-conspirators as Kanin had authorized Bauer to be freed from custody to continue the investigation. As a result, President Taylor makes Olivia Taylor her acting Chief of Staff.

She orders an airstrike on the Starkwood compound after Tony Almeida locates the bioweapon canisters, but is forced to abort when Hodges discovers the strike and threatens to deploy the missiles. She indirectly authorizes a deniable covert operation however, allowing Tony to destroy the canisters before the missiles could be launched.

After the Starkwood threat is averted and Jonas Hodges was taken into custody, she decides to offer Hodges an immunity and witness protection deal in exchange for information about the other co-conspirators. This leads to her daughter, the Acting Chief of Staff, Olivia, to order Hodges' assassination as revenge for Roger's death. This is later discovered and President Taylor is faced with the dilemma of either covering Olivia's crime up or turning her in to the authorities, decides the latter, stating that she swore an oath when she became President of The United States to uphold the constitution. This leads to her husband filing for a divorce, and in Season 8 she is no longer married.

President Taylor is in New York at the UN to sign a peace treaty with President Omar Hassan of the Islamic Republic of Kamistan. During the turmoil that would visit the day, she built a great rapport and deep trust and friendship with President Omar Hassan and his family. Following Hassan's assassination by IRK extremists who threatened New York with a dirty bomb and the assassination of President Omar Hassan, President Taylor called upon former president Charles Logan to assist in keeping the negotiations on-track. She is persuaded by Logan to cover-up Russian involvement in the day's events, and to lock-down Jack Bauer to stop him revealing it; when Bauer escapes all law-enforcement agencies are given "shoot to kill" orders in Taylor's name via President Charles Logan. Also at Logan's behest, she allows CTU mole Dana Walsh to be secretly tortured for the location of an incriminating data file she made and arrests journalist Meredith Reed to stop her publishing the story. When new IRK president Dalia Hassan learns of the cover-up she threatens to withdraw from the negotiations. Taylor responds by threatening to declare war and use the full might of the US military (strongly implied to include nuclear retaliation) on the country if the treaty is not signed.

During the season finale, Taylor has a moral epiphany and refuses to sign the peace treaty at the last moment as the last signee. She reveals the cover-up and the lengths many have gone to maintain it that day. She realizes that she betrayed her own moral fiber and guiding light. As the season progressed she insulated herself from others – much like is seen with Charles Logan before his fall from the presidency. He is also the "poison" that fatally sickens the Taylor administration. Citing her role in the cover-up, Taylor also plans to resign from office, surrender herself to the Attorney General and face whatever consequences there are for her actions. She also cancels Logan's order for Bauer to be murdered, but advises him to flee the country as both Americans and Russians will be after him for his actions. Taylor and Chloe both promise to buy him as much time as they can, but neither are sure how long he will have.

It is believed that Taylor's vice president Mitchell Hayworth concluded her term after her resignation.