Donald Trump's National Security Adviser is forced out after being accused of discussing U.S. sanctions with the Russian ambassador, and then lying about it. Diana speaks to a Washington Post reporter about how investigative journalists uncovered the facts that led to Michael Flynn's resignation. Plus - we'll hear from a Canadian professor who's challenging FBI data that suggests suspected terrorists are trying to get into the U.S. from Canada. Watch The Investigators Saturdays at 9:30 pm ET (replays Sundays at 5:30 pm ET) on CBC News Network.

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