Michele Kelemen

When the U.S. ambassador to Ukraine was abruptly removed from her post this year, some Democratic lawmakers called it "a political hit job." Now that ambassador is telling her side of the story.

The diplomat will be the sole witness Friday, the second day of public testimony in the impeachment inquiry. State Department colleagues say she was removed after a slander campaign by Rudy Giuliani.

The House impeachment inquiry moved out into the open on Wednesday with the nation hearing directly from key witnesses.

Acting Ambassador William Taylor and Deputy Assistant Secretary George Kent took copious notes about the Trump administration's dealings with Ukraine. They'll testify publicly Wednesday.

With public hearings in the impeachment inquiry set to start Wednesday. We examine the evidence: Do recently released testimonies indicate a presidential abuse of power?

Secretary of State Mike Pompeo has tried to stay out of the limelight in the impeachment inquiry, but as deposition transcripts are released, his role is coming into sharper focus.

The House impeachment committee has released more transcripts. The depositions paint a picture of parallel foreign policies toward Ukraine, raising questions about the secretary of state's role.

The House committees leading the impeachment inquiry into President Trump have released the transcript of their interview with former U.S. Ambassador to Ukraine Marie Yovanovitch.

The House committees conducting the impeachment probe released the first transcripts of closed-door witness interviews. The transcripts included those of the former ambassador to Ukraine.

Deputy Secretary of State John Sullivan has his Senate confirmation hearing Wednesday to become the next U.S. ambassador to Russia. He may face some tough questions on Ukraine.

Secretary of State Mike Pompeo was not in the situation room during the U.S. raid against ISIS. Instead, he was in Kansas, on a trip that has once again sparked questions about a possible Senate run.

The impeachment investigation has led to a growing number of public servants looking for lawyers as they try to abide by conflicting instructions from the White House and Congress.

In written testimony to Congress, Taylor said he "became increasingly concerned" about informal policymaking, driven by Rudy Giuliani, that diverged from official U.S. policy on Ukraine.

Ambassador Taylor, who's serving as the interim head of the U.S. diplomatic mission to Ukraine, is expected to appear before a House panel participating in the impeachment inquiry into the president.

Every administration uses ambassadorships to reward big political donors. But unlike other political appointees, donors don't always have strong resumes in business politics and foreign affairs.

The acting U.S. ambassador to Ukraine is also caught up in the impeachment inquiry. William Taylor is expected to be asked to appear next week before the House committees investigating the president.

Career diplomats are increasingly being subpoenaed by the House Committees leading an impeachment inquiry. They've raised concerns about President Trump's lawyer, Rudy Giuliani's dealings.

President Trump's former national security adviser John Bolton reportedly was trying to caution others about Rudy Giuliani's efforts in Ukraine. Giuliani is Trump's personal attorney.

Marie Yovanovitch, the former ambassador to Ukraine, says she was pushed out of her role based on "unfounded and false claims by people with clearly questionable motives."

Secretary of State Mike Pompeo is blocking employees from cooperating with the House committees leading an impeachment inquiry. The move is raising tensions between political and career officials.