The House select committee investigating the Jan. 6 Capitol riot sent a letter Thursday to Ivanka Trump requesting her cooperation with the investigation.

Driving the news: "We write to request your voluntary cooperation with our investigation on a range of critical topics," the chair wrote in a letter to the former president's daughter.

Why it matters: The chair's comments come two weeks after the Jan. 6 committee said that they have "firsthand testimony" that Ivanka Trump asked her father "at least twice" to "'please stop this violence'" during the riot.

What they're saying: "Ivanka Trump just learned that the January 6 Committee issued a public letter asking her to appear," an Ivanka Trump spokesperson said in a statement to Axios.

• "As the Committee already knows, Ivanka did not speak at the January 6 rally. As she publicly stated that day at 3:15pm, ‘any security breach or disrespect to our law enforcement is unacceptable. The violence must stop immediately. Please be peaceful,'" the spokesperson said.

Catch up quick: Chair of the committee Rep. Bennie Thompson (D-Miss.) suggested Thursday that the panel's request for Ivanka's cooperation in the investigation was forthcoming.

• "You will anticipate the committee inviting some people to come talk to us," Thompson told reporters in the Capitol, adding, "not lawmakers right now — Ivanka Trump."
• Thompson also said that he expects more witnesses and subpoenas to be called in the investigation, without giving a timeline on the process.

Editor's note: This story has been updated with new details throughout.