an amicus brief in support of Texas v. Pennsylvania, a lawsuit filed at the United States Supreme Court contesting the results of the 2020 presidential election, in which Joe Biden defeated incumbent Donald Trump. The Supreme Court declined to hear the case on the basis that Texas lacked standing under Article III of the Constitution to challenge the results of an election held by another state. Buck later became one of a group of seven Republicans who did not support their colleagues' efforts to challenge the results of the election on January 6, 2021. These seven signed a letter that, while giving credence to election fraud allegations Trump made, said Congress did not have the authority to influence the election's outcome. Abortion Buck opposes abortion, including in cases of rape and incest, but makes exceptions if the mother's life is in danger. Antitrust Buck favors bipartisan legislation designed to bolster the federal government's ability to bring antitrust cases against "Big Tech" companies. In 2021, he introduced the House version of the Open App Markets Act alongside Democrat Hank Johnson. Buck supports the proposed American Innovation and Choice Online Act. In 2022, Buck was one of 39 Republicans to vote for the Merger Filing Fee Modernization Act of 2022, an antitrust package that would crack down on corporations for anti-competitive behavior. COVID-19 Buck opposed many of Colorado's COVID-19 restrictions, including the closing of businesses. Of COVID-19 restrictions, he told The Denver Post, "we went like lambs to the slaughter. We can't allow that to happen again". Buck voted against the American Rescue Plan Act of 2021, calling it "funding for pet projects in Nancy Pelosi and Chuck Schumer's home states, money for Obamacare subsidies and Planned Parenthood, and stimulus checks for prisoners and illegal immigrants". Education Buck supports a revamp of the Department of Education and questions the department's constitutionality. Environment Buck rejects the scientific consensus on climate change. In an October 2010 meeting with supporters in Fort Collins, Colorado, he endorsed the views of Senator James Inhofe, saying, "Inhofe was the first person to stand up and say this global warming is the greatest hoax that has been perpetrated. The evidence just keeps supporting his view, and more and more people's view, of what's going on." According to a Buck spokesman, "Ken believes there is global warming but thinks the evidence points to it being natural rather than man-made." Foreign