Mike Pompeo's remarks were the second harshly critical speech about China from a senior Trump administration official in a week. Vice President Mike Pence delivered a similar critique of China last Thursday.
US officials previously said the Trump administration was considering sanctions against officials linked to China's crackdown on Muslims, including Xinjiang Party Secretary Chen Quanguo, who, as a member of the powerful politburo, is in the upper echelons of China's leadership.
Mike Pompeo, who is travelling in Greece, told reporters that he sent a letter in this regard to the Congress on Friday night which he said was the department's initial response to the documents requested by a Congressional committee.
Pompeo would not say whether he thought Trump's comments in the July 25 call with Ukrainian President Volodymyr Zelenskiy were inappropriate or whether he believed they warranted the complaint of an intelligence community whistleblower that triggered the impeachment probe.
The subpoena and demands for depositions were the first major investigative actions the House has taken since it launched impeachment proceedings this week in light of revelations that Trump pushed President Volodymyr Zelenskiy of Ukraine to investigate Joe Biden.
While conservative like Bolton, Pompeo has learned to advance his policy goals where he can, dispense with them when he has to and keep himself in the good graces of a notoriously fickle commander in chief.
Pompeo, an evangelical Christian who has portrayed himself as a champion of religious rights, reiterated past comments, saying that the treatment of the Uighurs and other Muslim minorities in China "may well end up being one of the worst stains on the world this century."
"Secretary Pompeo spoke by phone today with Danish Foreign Minister Jeppe Kofod regarding the postponement of President Trump’s travel to Denmark," State Department spokeswoman Morgan Ortagus said in statement.
US Secretary of State Mike Pompeo, who is on a three-day visit to India, and External Affairs Minister S Jaishankar on Wednesday held a joint press briefing, touching upon a wide range of issues, including bilateral trade.