A report claims that a warrant to eavesdrop on Carter Page, a former Trump campaign aide, was improperly obtained.
The arrest of the former agent, Jerry Chun Shing Lee, 53, capped an intense F.B.I. investigation that began around 2012 after the C.I.A. began losing its agents in China.
George Papadopoulos, a Trump foreign policy adviser, was the improbable match that set off a blaze that has consumed the first year of the Trump administration.
The Senate Intelligence Committee is examining links between Green Party candidate Jill Stein and Russia’s efforts to interfere with the 2016 election.
The Trump administration suggested the U.S. would act against North Korea beyond the sanctions now being imposed for its rapid expansion of its nuclear weapons program.
President Trump has offered lavish praise when the intelligence community or law enforcement investigates his opponents but rebuked them when their actions do not align with his interests.