Twitter (TWTR) chief executive Jack Dorsey said the social-media company he founded doesn’t “use political ideology” in making decisions and that from a business perspective the firm has incentive to keep all voices using the platform.

In prepared remarks released a day before his appearance before the US House Committee on Energy and Commerce, Dorsey said Twitter “must be a trusted and healthy place that supports free and open discussion” that ensures “all voices can be heard.”

“We believe strongly in being impartial, and we strive to enforce our rules impartially,” Dorsey said in the remarks. “We do not shadowban anyone based on political ideology.”

Dorsey’s appearance comes after President Donald Trump — a frequent Twitter user — recently lashed out at social media companies for “silencing millions of people.” And in July, he said that Twitter was “‘SHADOW BANNING’ prominent Republicans. Not good. We will look into this discriminatory and illegal practice at once!”

Shadow banning refers to the practice of making a person’s comments visible to only themselves and no one else on a platform. Dorsey said they fixed a problem that was identified in July of some accounts, including those of Republicans and Democrats, not being auto-suggested in searches.

Facebook’s (FB) Sheryl Sandberg, the company’s chief operating officer, is set to appear Wednesday at the US Senate Select Committee on Intelligence that the social media site is getting better at shutting down fake accounts and slowing the spread of false news.

“We’ve put in place new ad transparency policies, ad content restrictions, and documentation requirements for political ad buyers,” Sandberg will tell lawmakers, according to a copy of her remarks published by CNBC on Tuesday. “We’re getting better at anticipating risks and taking a broader view of our responsibilities. And we’re working closely with law enforcement and our industry peers to share information and make progress together.”

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