Gordon Sondland, the US ambassador to the European Union, will appear before the House under subpoena next week as part of the ongoing impeachment inquiry — despite an attempt by the State Department to block his testimony, his lawyers said Friday.

“After consultation with Committee Staff, his testimony is now scheduled for Thursday, October 17,” attorneys Robert Luskin and Kwame Manley said in a statement to The Post.

“Notwithstanding the State Department’s current direction to not testify, Ambassador Sondland will honor the Committees’ subpoena, and he looks forward to testifying on Thursday,” they said.

“Ambassador Sondland has at all times acted with integrity and in the interests of the United States. He has no agenda apart from answering the Committees’ questions fully and truthfully.”

Sondland had been scheduled to testify before the Foreign Affairs, Intelligence and Oversight committees in a House impeachment deposition Tuesday, but the State Department ordered him not to show up.

Chairmen Adam Schiff, Eliot Engel and Eljiah Cummings then subpoenaed Sondland — a key witness in the impeachment inquiry into President Trump’s conduct surrounding a July phone call with the Ukrainian president — to testify and turn over documents.

They demanded that Sondland turn over documents by Oct. 14, and appear for a deposition two days later.

But Sondland is not authorized to release the documents, his lawyers said Friday.

“He respects the Committees’ interest in reviewing all relevant materials; however, federal law and State Department regulations prohibit him from producing documents concerning his official responsibilities,” they said.

“Ambassador Sondland does not control the disposition of his documents,” they said, adding that the diplomat hopes the material will be shared with the committees before his Thursday appearance.

On Tuesday, the White House told House Democrats in a letter that the president and his administration would not cooperate in the impeachment inquiry — arguing the proceedings amount to an illegitimate effort to overturn the 2016 election results.

The inquiry is largely centered on Trump’s request during a July 25 phone call for Ukrainian President Volodymyr Zelensky to “look into” unsubstantiated corruption allegations against former Vice President Joe Biden and his son Hunter.

In text messages provided to Congress by former US special envoy to Ukraine Kurt Volker last week, US Ambassador to Ukraine William Taylor repeatedly questioned the decision to withhold millions of dollars in military aid to the country as a possible quid pro quo.

Sondland replied to Taylor that the diplomat was “incorrect about President Trump’s intentions,” according to CNN.

“The President has been crystal clear no quid pro quo’s of any kind. The President is trying to evaluate whether Ukraine is truly going to adopt the transparency and reforms that President Zelensky promised during his campaign,” Sondland wrote Taylor.

Meanwhile, former Ambassador to Ukraine Marie Yovanovitch — whom Trump recalled in May before her term was up after his supporters questioned her loyalty — is scheduled to meet with the committees behind closed doors Friday.