Larry Ellison, the billionaire co-founder and chairman of the software company Oracle and the biggest backer of Elon Musk’s attempted Twitter takeover, participated in a call shortly after the 2020 election that focused on strategies for contesting the legitimacy of the vote, according to court documents and a participant.

The Nov. 14 call included Sen. Lindsey O. Graham (R-S.C.); Fox News host Sean Hannity; Jay Sekulow, an attorney for President Donald Trump; and James Bopp Jr., an attorney for True the Vote, a Texas-based nonprofit that has promoted disputed claims of widespread voter fraud.

Ellison’s participation illustrates a previously unknown dimension in the multifaceted campaign to challenge Trump’s loss, an effort still coming into focus more than 18 months later. It is the first known example of a technology industry titan joining powerful figures in conservative politics, media and law to strategize about Trump’s post-loss options and confer with an activist group that had already filed four lawsuits seeking to uncover evidence of illegal voting.