President Donald Trump claimed newly released documents underlying the FBI’s surveillance of a former campaign adviser show the controversial Steele dossier was responsible for triggering the investigation into links between the Trump campaign and Russia.

On July 21, in response to a Freedom of Information Act request, the Justice Department released the warrant application used to obtain a wiretap on former Trump campaign adviser Carter Page starting in October 2016, a month after he parted ways with Trump’s team. Intelligence officials feared Page was a potential Russian agent, or the target of Moscow's recruiting efforts.

On Twitter, Trump claimed the surveillance application proves the Steele dossier launched the Russia probe.

"So we now find out that it was indeed the unverified and Fake Dirty Dossier, that was paid for by Crooked Hillary Clinton and the DNC, that was knowingly & falsely submitted to FISA and which was responsible for starting the totally conflicted and discredited Mueller Witch Hunt!" Trump tweeted July 23.

So we now find out that it was indeed the unverified and Fake Dirty Dossier, that was paid for by Crooked Hillary Clinton and the DNC, that was knowingly & falsely submitted to FISA and which was responsible for starting the totally conflicted and discredited Mueller Witch Hunt! — Donald J. Trump (@realDonaldTrump) July 23, 2018

Put simply, Trump is wrong about the triggering event. The Steele dossier did not launch the FBI’s investigation into links between the Trump campaign and Russia.

The dossier was used, to some extent, to persuade a Foreign Intelligence Surveillance Act court to authorize surveillance of Page. But it was the actions of another Trump campaign adviser — George Papadopoulos — that actually started the investigation.

Trump adviser George Papadopoulos triggered investigation

The federal government started looking into Russian election involvement in July 2016 based on information from Papadopoulos. This was confirmed by Republican members of the House Intelligence Committee.

"The Papadopoulos information triggered the opening of an FBI counterintelligence investigation in late July 2016 by FBI agent Pete Strzok," the House Intelligence Committee’s GOP members wrote in a Feb. 2 memo.

House Intelligence Committee Republicans confirmed in an April report it was Papadopoulos who set the FBI investigation in motion.

So, what was the "Papadopoulos information"?

According to the New York Times, Papadopoulos told a high-ranking Australian diplomat at an upscale London bar in May 2016 that Moscow had "political dirt" on Hillary Clinton. Australian officials relayed this information to their American counterparts.

Mueller appointed later

Trump also confused the timeline of Special Counsel Robert Mueller’s involvement.

The Papadopoulos discussion of Clinton dirt that triggered the investigation took place in May 2016. Yet an entire year would pass before Mueller entered the picture.

The Justice Department did not appoint Mueller to take over the FBI investigation until May 2017, roughly a week after Trump fired FBI director James Comey.

Our ruling

Trump said the Steele dossier "was responsible for starting" Special Counsel Robert Mueller’s investigation into links between the Trump campaign and Russia.

The Steele dossier did not trigger Mueller’s investigation. It was information from Trump campaign adviser George Papadopoulos that set the probe in motion. Also, Mueller did not take up the investigation until roughly a year after the triggering event.

We rate this False.