Members of Congress are increasing pressure on social media companies to protect next year’s census from disinformation online, concerned that foreign governments and internet trolls could disrupt the 2020 enumeration.

The latest push comes in a letter the Congressional Asian-Pacific American Caucus sent Thursday to Facebook Chief Operating Officer Sheryl Sandberg, asking her to speak with group members about steps to both promote the census and “combat interference and disinformation on its platform.” Russia or another country may try to push the census off course, they say, and Facebook and other companies should be prepared.

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“We look forward to engaging with you and your team to ensure that (Asian American Pacific Islanders) and other vulnerable communities are not targeted by malicious actors on your platform,” the letter said.

Congressional pressure on Facebook, Twitter and other social media giants over the census has added to growing concerns about the 2020 elections, political speech and privacy on the platforms. Lawmakers and experts worry that hostile agents may use social media platforms to throw off a process that determines the distribution of congressional seats and the flow of more than $800 billion in federal funding annually.