The appendix summarized opposition research memos prepared mainly by a retired British intelligence operative for a Washington political and corporate research firm. The firm was paid for its work first by Mr. Trump’s Republican rivals and later by supporters of his Democratic opponent, Hillary Clinton. The Times has checked on a number of the details included in the memos but has been unable to substantiate them.
The memos suggest that for many years, the Russian government of Mr. Putin has looked for ways to influence Mr. Trump, who has traveled repeatedly to Moscow to investigate real estate deals or to oversee the Miss Universe competition, which he owned for several years. Mr. Trump never completed any major deals in Russia, though he discussed them for years.
The former British intelligence officer who gathered the material about Mr. Trump is considered a competent and reliable operative with extensive experience in Russia, American officials said. But he passed on what he heard from Russian informants and others, and what they told him has not yet been vetted by American intelligence.
The memos describe sex videos involving prostitutes with Mr. Trump in a 2013 visit to a Moscow hotel. The videos were supposedly prepared as “kompromat,” or compromising material, with the possible goal of blackmailing Mr. Trump in the future.
The memos also suggest that Russian officials proposed various lucrative deals, essentially as disguised bribes in order to win influence over the real estate magnate.
The memos describe several purported meetings during the 2016 presidential campaign between Trump representatives and Russian officials to discuss matters of mutual interest, including the Russian hacking of the Democratic National Committee and Mrs. Clinton’s campaign chairman, John Podesta.
