Secretary of Energy Rick Perry plans to leave the Trump administration by the end of this year, he recently announced.

Perry's departure comes after President Donald Trump implicated him in allegations that Trump improperly pressured Ukrainian president Volodymyr Zelensky to investigate former Vice President Joe Biden's son Hunter Biden's work on the board of a Ukrainian oil and gas company.

After Axios reported that Trump placed the blame on Perry for pushing him to make the call, the three House committees pursuing the impeachment inquiry subpoenaed Perry for documents.

Here are all the top-level people who've either been fired or resigned from the Trump administration and why they left.

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Secretary of Energy Rick Perry, one of the original officials who has been in President Donald Trump's cabinet since the very beginning of the administration, resigned from his position and will be leaving later this year.

Perry's departure comes after Trump implicated him in the ongoing scandal involving Trump's communications with Ukraine.

Trump is currently facing an impeachment inquiry over allegations that in a July 25 phone call, he improperly pressured Ukrainian president Volodymyr Zelensky to investigate former Vice President Joe Biden's son Hunter Biden's work on the board of Burisma Holdings, and Ukrainian oil and gas company.

Read more: Trump is reportedly blaming Rick Perry for his infamous call with the Ukrainian president

After Axios reported that Trump placed the blame on Perry for pushing him to make the call, the three House committees pursuing the impeachment inquiry subpoenaed Perry for documents.

Before serving in the Trump administration, Perry was the governor of Texas and a candidate for the Republican presidential nomination in 2012.

The Trump administration has been rocked by high-profile departures — including James Mattis as defense secretary and John Kelly as chief of staff — since Trump took office in January 2017.

Here are all the top-level people who've either been fired or resigned from the administration and why they left.