WASHINGTON — The C.I.A. told senior lawmakers in classified briefings last summer that it had information indicating that Russia was working to help elect Donald J. Trump president, a finding that did not emerge publicly until after Mr. Trump's victory months later, former government officials say.
The briefings indicate that intelligence officials had evidence of Russia's intentions to help Mr. Trump much earlier in the presidential campaign than previously thought. The briefings also reveal a critical split last summer between the C.I.A. and counterparts at the F.B.I., where a number of senior officials continued to believe through last fall that Russia's cyberattacks were aimed only at disrupting America's political system, and not at getting Mr. Trump elected, according to interviews.