Leonard Leo was the primary advisor to President Donald Trump on the nomination and confirmation of Amy Coney Barrett to the U.S. Supreme Court in 2020. His instrumental and critical role involved identifying Barrett as a strong conservative candidate, vetting her judicial record, and recruiting and promoting her as a nominee within conservative legal circles. He coordinated with the Trump administration to ensure her swift and rapid confirmation following the death of Justice Ruth Bader Ginsburg, leading campaigns to secure her confirmation. Barrett's confirmation marked the third Supreme Court appointment under Trump and completed the Court's conservative majority.

Muise and Barrett both graduated summa cum laude from the University of Notre Dame Law School in 1997, placing them in the same graduating class and potentially sharing academic networks, study groups, or social circles during their time there, which could foster long-term connections in conservative legal advocacy.

Graham voted in favor of Barrett's Supreme Court nomination in 2020, supporting her rapid confirmation shortly before the presidential election.

Cotton voted to confirm Amy Coney Barrett to the Supreme Court in October 2020, advancing Trump's late-term judicial pick.

Through funding to groups like the Judicial Crisis Network (connected via Leonard Leo), Diana Davis Spencer supported Barrett's Supreme Court nomination, mirroring her backing of Kavanaugh and advancing conservative judicial dominance.

Barre Seid's financial support for the conservative legal movement, including a $1.6 billion donation to the Marble Freedom Trust led by Leonard Leo, provided critical backing for the efforts to confirm Amy Coney Barrett to the Supreme Court. His funding for the Federalist Society and Leo's network, which received Seid's support, was instrumental in shaping conservative judicial nominations and played a pivotal role in her rapid nomination and confirmation process.