READ: Ex-Ukraine ambassador's opening statement in impeachment hearing

Former U.S. Ambassador to Ukraine Marie YovanovitchMarie YovanovitchLawyer says Parnas can't attend Senate trial due to ankle bracelet Giuliani calls Bolton a 'backstabber' over Ukraine allegations Parnas asks court for permission to turn over more evidence to Democrats MORE testified on Friday that she believes Rudy GiulianiRudy GiulianiLawyer says Parnas can't attend Senate trial due to ankle bracelet Perry delegation talking points stressed pushing Ukraine to deal with 'corruption' Giuliani calls Bolton a 'backstabber' over Ukraine allegations MORE and associates of the president's personal attorney pushed for her ouster earlier this year, calling it a "smear campaign."

She argued during the second public hearing of the House impeachment inquiry that the system was successfully manipulated to push for her removal.

"Unfortunately, as the past couple of months have underlined, not all Ukrainians embraced our anti-corruption work," she said, referring to her time as ambassador.

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"What continues to amaze me is that they found Americans willing to partner with them and, working together, they apparently succeeded in orchestrating the removal of a U.S. ambassador. How could our system fail like this? How is it that foreign corrupt interests could manipulate our government?" she said.

Read Yovanovitch's full opening statement below.