Special Counsel Robert Mueller has sent a letter to the White House requesting it preserve all documents relating to Donald Trump Jr.'s meeting with a Russian lawyer last June, CNN first reported.

What they're requesting: emails, text messages, notes, voicemails, and any other documents about that June 9 meeting, as well as any communications about it since then.

Why this matters: This notice further confirms Mueller and his team are investigating Trump Jr.'s meeting, which was first suggested when he requested an interview from Ike Kaveladze, the 8th person who was revealed to have been in the meeting. And Axios previously learned that Trump's legal counsel advised him to avoid any discussions of the Russia probes with Jared Kushner, ultimately as a way to protect Trump since Kushner is so wrapped up in them. This all suggests the Russia probes are getting closer to Trump by way of those who are rather close to him, ultimately making it harder for him to avoid addressing.