An investigation into how lies about election fraud have made their way to the center of American politics

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A year after President Joe Biden’s inauguration, around two-thirds of Republican voters believe his election was illegitimate, and the idea that the 2020 election was stolen from Donald Trump is now a defining issue of the Republican Party.

In a new investigative collaboration, FRONTLINE and ProPublica trace the hidden sources of misinformation about the 2020 election, demonstrating how a handful of people have had an outsized impact on the current U.S. crisis of democratic legitimacy.

Watch the trailer, above, for “Plot to Overturn the Election.” The full documentary will be available March 29 at 10p ET.

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FRONTLINE is produced at GBH in Boston and is broadcast nationwide on PBS. Funding for FRONTLINE is provided through the support of PBS viewers and by the Corporation for Public Broadcasting. Additional support for FRONTLINE is provided by the Abrams Foundation, the John D. and Catherine T. MacArthur Foundation, the Park Foundation; and the FRONTLINE Journalism Fund with major support from Jon and Jo Ann Hagler on behalf of the Jon L. Hagler Foundation, and additional support from Koo and Patricia Yuen, and Joseph Azrack and Abigail Congdon.