Kamala Harris was sworn in as a U.S. Senator for California, succeeding Barbara Boxer. This marked her entry into national politics and gave her a platform to advocate for her policy priorities on a national level.

Harris served on several key Senate committees, including the Intelligence Committee, the Judiciary Committee, the Homeland Security and Governmental Affairs Committee, and the Budget Committee. Her committee assignments allowed her to focus on issues related to national security, law enforcement, and government oversight.

Harris gained national attention for her sharp questioning of Brett Kavanaugh during his Supreme Court confirmation hearings. Her interrogation focused on Kavanaugh's views on abortion rights and his past conduct.

As a Senator, Harris introduced and co-sponsored numerous pieces of legislation on issues ranging from criminal justice reform to healthcare to immigration. She worked to address issues such as affordable housing, climate change, and economic inequality.

Harris was a vocal critic of the Trump administration's policies, particularly on issues such as immigration, healthcare, and environmental protection. She frequently spoke out against what she saw as injustices and abuses of power.