In a separate tweet, Mr Trump accused Democratic senator Dianne Feinstein of being "underhanded and a disgrace" for disclosing details of a dossier of allegations about his ties to Russian Federation during the presidential campaign.
"He [Steele] thought from his perspective there was an issue - a security issue about whether a presidential candidate was being blackmailed", Simpson said.
In a shocking move, Feinstein unilaterally published Simpson's testimony this week. Although it contained no bombshells, Simpson's testimony indicates that Steele was so troubled by what he found that he contacted the Federal Bureau of Investigation to alert it to what he considered a possible crime.
LUCAS: Well, Simpson says that the former British agent who compiled the information in the dossier - it was a man by the name of Christopher Steele - went to the Federal Bureau of Investigation after writing his initial memo in June of 2016.
"My understanding was that they believed Chris at this point - that they believed Chris might be credible because they had other intelligence that indicated the same thing and one of those pieces of intelligence was a human source from inside the Trump organisation", Simpson said.
What we know now, though, is that the so-called inside source was actually the Australian diplomat Alexander Downer, who passed information to the Federal Bureau of Investigation in the summer of 2016.
According to the suits, false allegations include claims that: Cohen had an inappropriate relationship with the Russian government stemming from his wife's family; Cohen secretly met with Russian officials to contain former campaign manager Paul Manafort's connection to Russia and Ukraine; and Cohen developed contingency plans to hide cash payments to Russian hackers. In 2017, Papadopoulos pleaded guilty to lying to the Federal Bureau of Investigation and is cooperating with investigators. Now we have two senators, Chuck Grassley and Lindsey Graham who have been lying through their teeth about the testimony from Fusion GPS executives.
Levy did not expand on that claim in the interview, nor is there any public information that would tie a specific killing to the information in the dossier.
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During the 2016 campaign, Fusion GPS employed the wife of senior DOJ official Bruce Ohr as a subcontractor on the Trump project.
Representatives for Fusion GPS declined to comment. Fusion GPS, which hired Steele, was funded by the Clinton campaign and the Democratic National Committee. He used his network of contacts in east European intelligence services to examine Mr Trump's ties in Russian Federation for Fusion GPS, which was originally hired the candidate's Republican opponents.
Fusion GPS commissioned the so-called Steele dossier, a controversial compilation of alleged ties between Trump and Russian Federation. "It was a long history of associations with people accused of involvement in criminal activity".
"The Republicans on that committee didn't consult with her with respect to their referral to the Department of Justice", Murphy said, referring to Grassley and Sen. Shortly after, Feinstein released the transcript.
Grassley called the release "disappointing" and his office put out a statement saying it "undermines the integrity of the committee's oversight work and jeopardizes its ability to secure candid voluntary testimony". As concerns mounted about Russia's attempts to interfere with the election, Steele brought some of his research to the Federal Bureau of Investigation.
"The one regret I have is that I should have spoke with Senator Grassley before".
Last fall, Feinstein, 84, announced her decision to seek a sixth Senate term this year.