Timeline: Here’s what we know about the intelligence Trump shared with the Russians

US Army Lieutenant General H.R. McMaster looks on as US President Donald Trump announces him as his national security adviser at his Mar-a-Lago resort in Palm Beach, Florida, on February 20, 2017.

Now playing

00:54

McMaster: Trump unaware of intel source

President Donald Trump speaks during a rally, Thursday, Aug. 2, 2018, at Mohegan Sun Arena at Casey Plaza in Wilkes Barre, Pa. (AP Photo/Matt Rourke)

Now playing

02:16

Trump slams probe 'hoax' despite intel warning

MOSCOW, RUSSIA - NOVEMBER 09: Emin Agalarov, Donald Trump and Aras Agalarov attend the red carpet at Miss Universe Pageant Competition 2013 on November 9, 2013 in Moscow, Russia. (Photo by Victor Boyko/Getty Images)

Now playing

02:23

Russian pop star trolls Trump in music video

Trump WH 5

Now playing

01:31

Trump: It is possible I will meet with Putin

Now playing

01:06

Toobin calls Giuliani claim 'corrupt and unethical'

Now playing

00:54

Giuliani: Stop the possibility of impeachment

Now playing

03:03

GOP members slam Trump's Russia comments

Now playing

00:10

Putin says he and Trump speak 'regularly'

Now playing

01:38

Giuliani: Trump has right to know FBI source

Now playing

01:21

Trump says 'disgraceful' if FBI spied on campaign

Now playing

01:34

Trump lawyers seek to limit Mueller interview

Now playing

02:45

Page: Never found anything unusual about FBI source

WASHINGTON, DC - JUNE 08: Former FBI Director James Comey testifies before the Senate Intelligence Committee in the Hart Senate Office Building on Capitol Hill June 8, 2017 in Washington, DC. Comey said that President Donald Trump pressured him to drop the FBI's investigation into former National Security Advisor Michael Flynn and demanded Comey's loyalty during the one-on-one meetings he had with president. (Photo by Chip Somodevilla/Getty Images)

Now playing

01:08

Comey: Trump won't criticize Putin, even in private

Now playing

02:27

Nikki Haley: I don't get confused

US President Donald Trump (L) chats with Russia's President Vladimir Putin as they attend the APEC Economic Leaders' Meeting, part of the Asia-Pacific Economic Cooperation (APEC) leaders' summit in the central Vietnamese city of Danang on November 11, 2017. / AFP PHOTO / SPUTNIK / Mikhail KLIMENTYEV (Photo credit should read MIKHAIL KLIMENTYEV/AFP/Getty Images)

Now playing

02:03

Russia reacts to Trump's Syria strike tweets

US President Donald Trump and Russia's President Vladimir Putin hold a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Now playing

01:26

US hits Putin allies with new sanctions