"Who paid for it?
During the Republican primaries, a research firm called
Fusion GPS was hired by The Washington Free Beacon, a conservative website, to unearth potentially damaging information about Mr. Trump. The Free Beacon — which was funded by a major donor supporting Mr. Trump’s rival for the party’s nomination, Senator Marco Rubio of Florida — told Fusion GPS to stop doing research on Mr. Trump in May 2016, as
Mr. Trump was clinching the Republican nomination.
After Mr. Trump secured the nomination, Fusion GPS was hired on behalf of Mrs. Clinton’s campaign and the D.N.C. by their law firm, Perkins Coie, to compile research about Mr. Trump, his businesses and associates — including possible connections with Russia. It was at that point that Fusion GPS hired Mr. Steele, who has deep sourcing in Russia, to gather information." - The New York Times
"Papadopoulos had contacts with Russian intermediaries during the campaign,
according to the Justice Department, and later pleaded guilty to lying to the FBI about those contacts. While he was a Trump campaign adviser, Papadopoulos met with a professor with connections to Russian government officials who told him “about the Russians possessing ‘dirt’ on then-candidate Hillary Clinton in the form of ‘thousands of emails,'” and he tried to arrange a meeting between the Russian government and the campaign, the DOJ’s statement of the offense said." - Factcheck.org