Russia has been trying to intervene in the Democratic primaries to aid Senator Bernie Sanders, according to people familiar with the matter, and Mr. Sanders said on Friday that intelligence officials recently briefed him.
The disclosure came a day before the Nevada caucuses, where Mr. Sanders is a favorite, and followed revelations a day earlier that Moscow was interfering on President Trump’s behalf this year, as it did in 2016.
2020 ELECTIONBernie Sanders wins the Nevada caucuses.
Mr. Sanders denounced Russia in a statement, calling President Vladimir V. Putin an “autocratic thug” and warning Moscow to stay out of the election. Drawing a contrast with Mr. Trump, he said he would stand against any efforts by Russia or another foreign power to interfere in the vote.