Here are all the Russia investigation memos that we know about and what's in them

J. Scott Applewhite/AP

House Intelligence Committee Chairman Rep. Devin Nunes, R-Calif.

Since President Donald Trump officially authorized the release of House Intelligence Committee Chair Devin Nunes's controversial memo on the Russia investigation on February 2, a host of other memos have seized Washington's and the public's attention.

In response to the Nunes memo, which alleges misconduct on the part of the Justice Department and FBI, Democrats on the House Intelligence Committee put forward a memo of their own, which is expected to be released Friday. Nunes has also said he plans to release five more as part of an independent investigation he's been conducting since last year into alleged corruption within the government. 

It can be difficult to make sense of the complex array of narratives and events presented in these memos. Here's a rundown of all the Russia investigation memos that we know about so far and what they might contain: