The president is angry Senator Mark Warner tried to meet the Russia dossier creator—but so did Devin Nunes.
In testimony released Tuesday, Glenn Simpson spoke about dossier author Christopher Steele.
Two GOP Senators recommended criminal charges against the dossier's author.
Former colleagues of the British spy who compiled the controversial dossier have backed his work.
Fusion GPS denies it paid money to journalists to spread reports about its dossier alleging Donald Trump's links to Russia.
The most salacious aspects of the Trump-Russia dossier will be probed in an interview with one of the president's most trusted confidants.
The Washington Free Beacon, a conservative website largely funded by Republican donor Paul Singer, was the first to hire firm Fusion GPS.
The Clinton campaign and DNC helped finance the Steele dossier, but important elements of the document have panned out.
The Campaign Legal Center says the Clinton campaign wasn't up front about paying for research on supposed ties between Donald Trump and Russia.
The Republican National Committee was outraged at a report that Hillary Clinton's campaign financed the Steele dossier but left out one important fact.
The former Hillary Clinton press secretary said he would have helped compile the Trump-Russia dossier if he knew about it.
The dossier made explosive and salacious allegations about President Donald Trump's links to Russia.
President Donald Trump has made another explosive and unsubstantiated suggestion on Twitter.
The Steele dossier is the subject of investigations into possible collusion between Trump and Russia.
Simpson’s research firm is at the heart of multiple allegations of ties between President Donald Trump and Russia.
Glenn Simpson, whose firm compiled an infamous dossier on Donald Trump, spent more than 10 hours talking with Senate investigators.
Christopher Steele has gone into hiding since his explosive allegations about President Donald Trump were made public.
A newcomer to politics, businessman Trump has been at odds with U.S. spy agencies for months, disputing their conclusions that Russia used hacking and other tactics.