Facebook removed a number of ads placed by Sen. Elizabeth Warren’s presidential campaign against tech giants like Amazon, Google, and Facebook, although it later restored them.

The specific ads target tech companies and surfaced online last week, after Warren announced that she would work to break up the firms by reversing large acquisitions, if elected president in 2020.

Shortly after reports surfaced, Facebook said that the specific ads were removed because they violated teh company's policies against use of Facebook's corporate logo. "In the interest of allowing robust debate, we are restoring the ads,” Facebook said.

“Three companies have vast power over our economy and our democracy. Facebook, Amazon, and Google,” the original ads read. “We all use them. But in their rise to power, they’ve bulldozed competition, used our private information for profit, and tilted the playing field in their favor.”

The ads were replaced with text that read, “This ad was taken down because it goes against Facebook’s advertising policies.”

In a tweet, Warren wrote, “Curious why I think FB has too much power? Let’s start with their ability to shut down debate over whether FB has too much power. Thanks for restoring my posts. But I want a social media marketplace that isn’t dominated by a single censor.”

Last week, Elizabeth Warren announced that she would work to break up giant tech companies like Facebook and Google.