This is the statement Schiff is referring to, he just left out the part where China is influencing US policy and pressuring politicians.
Statement by NCSC Director William Evanina: Election Threat Update for the American Public
…
CHINA – We assess that China prefers that President Trump – whom Beijing sees as unpredictable – does not win reelection. China has been expanding its influence efforts ahead of November 2020 to shape the policy environment in the United States, pressure political figures it views as opposed to China’s interests, and deflect and counter criticism of China. Although China will continue to weigh the risks and benefits of aggressive action, its public rhetoric over the past few months has grown increasingly critical of the current Administration’s COVID-19 response, closure of China’s Houston Consulate, and actions on other issues. For example, it has harshly criticized the Administration’s statements and actions on Hong Kong, TikTok, the legal status of the South China Sea, and China’s efforts to dominate the 5G market. Beijing recognizes that all of these efforts might affect the presidential race.
https://www.dni.gov/index.php/ncsc-newsroom/item/2140-statement-by-ncsc-director-william-evanina-election-threat-update-for-the-american-public
https://www.breitbart.com/clips/2020/09/07/schiff-ag-barr-is-just-flat-out-lying-to-the-american-people-about-china-election-threat/