The Latest on President Donald Trump and House impeachment hearings (all times local):

8:35 a.m.

The former U.S. Ambassador to Ukraine has arrived on Capitol Hill to testify in the Trump impeachment inquiry.

Marie Yovanovitch is the witness for the second day of public hearings. She’s expected to tell lawmakers about her sudden ouster as President Donald Trump recalled the career ambassador back to the United States.

Other diplomats testifying in the investigation have defended Yovanovitch, saying she was the target of “smear” campaign by the president’s allies. She has served both Democratic and Republican presidents.

The rare impeachment inquiry is focused on Trump’s actions toward Ukraine. Democrats say it amounts to bribery, as the president withheld military aid to Ukraine while he pushed the country to investigate rival Democrats, including Joe Biden.

Trump calls the probe a hoax and says he did nothing wrong.

12:15 a.m.

The House will hear from a singular witness Friday in the Trump impeachment hearings: Marie Yovanovitch, the former U.S. ambassador to Ukraine who was targeted by the president’s allies in a “smear” campaign now central to the probe.

The career diplomat, who served both Republican and Democratic presidents, is expected to relay her striking story of being suddenly recalled by Donald Trump and told to “watch my back.” It was all part of a swiftly developing series of events that sounded alarms about the White House’s shadow foreign policy.

Friday is the second day of public hearings to consider removing America’s 45th president. Democrats and Republicans are hardening their messages to voters as they try to sway voter opinion amid a deeply polarized public.

The House will hear from a singular witness Friday in the Trump impeachment hearings: Marie Yovanovitch, the former U.S. ambassador to Ukraine who was targeted by the president’s allies in a “smear” campaign now central to the inquiry.