Administration Insiders Who Waved A Red Flag In The Ukraine Affair

President Trump's efforts to pressure the government of Ukraine didn't sit well with some key members of his administration.

One of them, whose identity remains unverified, felt strongly enough to write down his concerns about the president's actions in a whistleblower complaint to the intelligence community's inspector general.

But he wasn't the only one who spoke up.

Here's what you need to know about some of the government officials known to have raised red flags about Trump's strategy for Ukraine. Most of the activity remained confidential, but Democrats' impeachment inquiry...