Three U.S. House committees issued a subpoena on October 10 for Perry to turn over documents on any role he played in Trump's effort to get Ukraine's President Volodymyr Zelenskiy to investigate his political rival in the 2020 election.
Word of Perry's resignation came as Trump traveled to Texas for a rally on Thursday evening.
U.S. Senator Shelley Moore Capito said Perry has been key in addressing some of the state's top priorities.
Perry had helped bring together a deal to sell US coal to Ukraine and had worked with the Ukraine and other countries to lessen European dependence on Russian gas by in part offering imports of USA liquefied natural gas, a booming industry.
Trump and Perry's relationship soured, according to reporting from multiple outlets, as the president began to feel the heat from his decision to encourage Ukrainian President Volodymyr Zelenskiy to investigate former Vice President Joe Biden and Biden's son, Hunter Biden.
Dan Brouillette had been the expected successor of Perry, who says his departure announcement Thursday was long planned and not related to his role in administration actions on Ukraine that are now the focus of a House impeachment panel for Trump.
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The mediation panel has reached an agreement between a few parties and they may file before the court. It is expected that the judgment, in this case, would be passed before the retirement of CJI Gogoi.
With regard to his leaving Washington, Perry said, "I've been looking at this for some time", in an interview on CNBC Friday.
"I don't know of a single issue where he differs from the president", McMonigle said.
Trump said he already has Perry's replacement but did not announce who it would be. "I appreciate his service to our nation both as Secretary of Energy and the Governor of Texas".
The administration has been working to get Ukraine back into the "sphere of influence of the United States", said Perry, and that meant to get rid of corruption in Ukraine.
Perry didn't answer whether he would comply with a congressional subpoena or provide testimony as part of the ongoing impeachment inquiry.