Microsoft is in talks to buy TikTok’s U.S. operations.

On Friday,media reported that Microsoft was in talks to buy TikTok’s U.S. operations, a message from investment banking sources who have yet to receive comments from TikTok or Microsoft. Microsoft did not testify this week at an antitrust hearing in the U.S. Congress along with four other tech giants.

Antitrust experts say Microsoft’s absence is likely due to its focus on serving commercial customers, which has not come under the same scrutiny as Apple, Google, Amazon and Facebook, and that the acquisition of TikTok’s U.S. business could put Microsoft under more antitrust attention.

It comes after Democratic U.S. Senator Richard Blumenthal and Republican Senator Josh Hawley sent letters to the Justice Department urging an investigation into video technology companies Zoom and TikTok. The two lawmakers said the Justice Department must investigate whether the data processing methods of the two companies pose a risk to the United States.

Microsoft is in talks to buy TikTok's U.S. operations.