Mark Zuckerberg on Monday the social networking giant is already combating foreign interference in the 2020 election.

In a conference call with reporters Monday, Zuckerberg reiterated a a blog post saying the Menlo Park, Calif., company removed three networks of fake accounts tied to Iran and one network with links to Russia’s Internet Research Agency, which was accused of interfering in the 2016 presidential election.

Facebook also removed 135 alleged fake accounts that originated in Iran focusing on US race relations, Black Lives Matter and tensions between Israel and the Palestinian territories. Some 50 Instagram accounts that originated in Russia were removed, the company said.

“The people behind this operation often posted on both sides of political issues including topics like US elections, environmental issues, racial tensions, LGBTQ issues, political candidates, confederate ideas, conservatism and liberalism,” Facebook said in the post. “They also maintained accounts presenting themselves as local in some swing states, and posed as either conservatives or progressives.”

Zuckerberg made the comments in a call intended to show that Facebook is taking election security seriously following allegations that the company allowed users to be besieged by misinformation from bad actors during the 2016 presidential race.

“This is one of my top priorities for the company,” Zuckerberg said in a conference call with reporters. “Elections have changed significantly, and Facebook has changed, too.”

Zuckerberg said the company will more clearly marking content from state-owned media. It will also be cracking down on any attempts to suppress voting through ads, including banning ads that “suggest voting is useless or advise people not to vote,” or that misrepresent polling dates or locations.

And he reiterated a blog post saying that the social networking giant has already been combating attempts to meddle in the 2020 election by removing three networks of fake accounts tied to Iran and one network with links to Russian Internet Research Agency, which was accused of interfering in the 2016 presidential election.

Facebook also removed 135 alleged fake accounts the originated in Iran focusing on US race relations, Black Lives Matter and tensions between Israel and Palestine. Some 50 Instagram accounts were removed that originated in Russia, the company said.

“The people behind this operation often posted on both sides of political issues including topics like US elections, environmental issues, racial tensions, LGBTQ issues, political candidates, confederate ideas, conservatism and liberalism,” Facebook said in the post. “They also maintained accounts presenting themselves as local in some swing states, and posed as either conservatives or progressives.”