Presidential candidate Sen. Elizabeth Warren, D-Mass., took aim at Facebook CEO Mark Zuckerberg in a series of tweets on Monday night. The attack came one week after the release of a recording where Zuckerberg is heard telling employees that a Warren administration would represent an "existential" threat to the company.

Warren Tweets

In Monday's tweets, Warren drew a line from Zuckerberg's meeting with President Donald Trump in Washington, D.C., last week to Facebook's policy change regarding political ads. On Sept. 24, Facebook announced it would not fact check or remove content by politicians even if it violates the company's rules. Facebook's vice president of global affairs and communications Nick Clegg wrote, "it is not our role to intervene when politicians speak," in a blog post announcing the new policy. Clegg said they would make exceptions only if a politician's speech endangers people or is a paid ad that violates its rules.

"The public deserves to know how Facebook intends to use their influence in this election," Warren wrote in the first of a string of tweets Monday. "For instance, Trump and Zuckerberg met at the White House two weeks ago. What did they talk about?" she wrote in a later tweet.