Secretary of State Marco Rubio announced the closure of an office designed to counter foreign disinformation, which conservatives claim was used to silence free speech.

The culling of the office will leave the State Department without a way to actively counter the increasingly sophisticated disinformation campaigns from foreign governments like those of Russia, Iran, and China. The office could be shuttered as soon as today, according to sources at the State Department who spoke with MIT Technology Review.

Leading Republicans have long accused the Counter Foreign Information Manipulation and Interference office of silencing conservative voices.