Intelligence officials warned House lawmakers last week that Russia was interfering in the 2020 campaign to try to get President Trump re-elected, five people familiar with the matter said, in a disclosure that angered Mr. Trump, who complained that Democrats would use it against him…

During the briefing to the House Intelligence Committee, Mr. Trump’s allies challenged the conclusions, arguing that Mr. Trump has been tough on Russia and strengthened European security. Some intelligence officials viewed the briefing as a tactical error, saying that had official who delivered the conclusion spoken less pointedly or left it out, they would have avoided angering the Republicans.