Fiona Hill, a former top National Security Council expert on Russia, was testifying to Congress behind closed doors Monday, the latest former Trump administration official to be subpoenaed as part of the House impeachment inquiry into President Donald Trump.

Two Florida businessmen tied to President Donald Trump’s lawyer and the Ukraine investigation were charged Thursday with federal campaign finance violations. 

The White House declared Tuesday it will halt any and all cooperation with what it termed the “illegitimate” impeachment probe by House Democrats, sharpening the constitutional clash between President Donald Trump and Congress.

House Democrats are marching forward with their impeachment inquiry into President Donald Trump, with more depositions coming this week.

U.S. Rep. Adam Schiff, chairman of the U.S. House Intelligence Committee, spent Thursday morning in Washington, D.C., as the impeachment inquiry of President Trump began in earnest. By Thursday evening, Schiff is set to be in the Chicago area.

How is a formal impeachment inquiry likely to play to voters? We ask Tom Bowen of New Chicago Consulting and Jennifer Nevins, a self-described pro-Trump conservative activist.

President Trump repeatedly prodded Ukraine’s new leader to work with the U.S. attorney general and lawyer Rudy Giuliani to investigate Democratic political rival Joe Biden, according to a rough transcript summarizing the call.

House Speaker Nancy Pelosi launched a formal impeachment inquiry against President Donald Trump on Tuesday, acquiescing to mounting pressure from fellow Democrats.

President Donald Trump irritably defended himself Friday against an intelligence whistleblower’s potentially explosive complaint, including an allegation of wrongdoing in a reported private conversation Trump had with a foreign leader.

Ukrainian separatists have returned the bodies of those who died in the recent plane crash after much negotiation. We have the latest on the situation in Ukraine after a Malaysian Airlines plane was shot down near the Russian border.

A Malaysia Airlines plane crashes in the politically heated Ukrainian territory. Was it an accident or terrorism? And could the incident touch off new international tensions. 

Rep. Mike Quigley talks with Carol Marin about the situation in Ukraine, minimum wage, the upcoming Senate election, and more. View a timeline of Rep. Quigley's career.

As Russia moves swiftly to annex Crimea, we talk with former NATO Ambassador Ivo Daalder about the crisis in Ukraine and what he thinks the West’s response should be. View a timeline of key events in Ukraine's political crisis and read an article about the local Ukrainian population’s reaction to the current state of affairs.

As Russia continues to assert its influence in Crimea, concern grows among the Chicago Ukrainian community. Read an article.

Sen. Mark Kirk had strong words today in reaction to the latest news out of Ukraine. Paris Schutz has the details. Read President Obama's statement on Ukraine from this morning and watch a web extra video.

As Russian troops tighten their grip on Ukraine's Crimean Peninsula and Western powers scramble to respond, we talk with Chicagoan and former U.S. ambassador to NATO, Ivo Daalder.