Shown is a letter from Secretary of State Mike Pompeo to Rep. Eliot Engel, D-N.Y., Chairman of the House Foreign Affairs Committee, Tuesday, Oct. 1, 2019 in Washington. (AP Photo/Wayne Partlow)

Shown is a letter from Secretary of State Mike Pompeo to Rep. Eliot Engel, D-N.Y., Chairman of the House Foreign Affairs Committee, Tuesday, Oct. 1, 2019 in Washington. (AP Photo/Wayne Partlow)

WASHINGTON (AP) — Setting a defiant tone, the Trump administration resisted Congress’ access to impeachment witnesses Tuesday, even as House Democrats warned such efforts themselves could amount to an impeachable offense.

Secretary of State Mike Pompeo tried to delay five current and former officials from providing documents and testimony in the impeachment inquiry that could lead to charges against President Donald Trump. But Democrats were able to set closed-door depositions for Thursday for former special envoy to Ukraine Kurt Volker and next week for ousted U.S. Ambassador Marie Yovanovitch.

The escalating exchange of accusations and warnings signaled yet another stiffening in the confrontation between the executive and legislative branches amid the Democrats’ launching of the impeachment inquiry late last week. That followed a national security whistleblower’s disclosure of Trump’s July phone call seeking help from the new Ukrainian president in investigating Democratic political rival Joe Biden and Biden’s son Hunter.

In a Tuesday evening tweet, Trump cast the impeachment inquiry as a coup “intended to take away the Power of the People, their VOTE, their Freedoms, their Second Amendment, Religion, Military, Border Wall, and their God-given rights as a Citizen of The United States of America!” In fact, a coup is usually defined as a sudden, violent and illegal seizure of government power. The impeachment process is laid out in the U.S. Constitution.

Pompeo said the Democrats were trying to “intimidate” and “bully” the career officials into appearing and claimed it would be “not feasible” as demanded. House investigators countered that it would be illegal for the secretary to try to protect Trump by preventing the officials from talking to Congress.

Some Trump supporters cheered Pompeo’s muscular response to the Democrats. But it also complicated the secretary’s own situation, coming the day after it was disclosed that he had listened in during Trump’s July phone call with Ukrainian leader Volodymyr Zelenskiy that helped trigger the impeachment inquiry.

“Any effort to intimidate witnesses or prevent them from talking with Congress — including State Department employees — is illegal and will constitute evidence of obstruction of the impeachment inquiry,” said three House chairmen, Adam Schiff of the intelligence committee, Eliot Engel of Foreign Affairs, and Elijah Cummings of Oversight.

They said that if he was on Trump’s call, “Secretary Pompeo is now a fact witness in the House impeachment inquiry.” And they warned, “He should immediately cease intimidating Department witnesses in order to protect himself and the President.”

On Wednesday, the State Department’s inspector general is expected to brief congressional staff from several House and Senate appropriations, oversight, foreign affairs and intelligence committees on their requests for information and documents on Ukraine, according to an aide familiar with the planning. The inspector general acts independently from Pompeo.

The committees are seeking voluntary testimony from the current and former officials as the House digs into State Department actions and Trump’s other calls with foreign leaders that have been shielded from scrutiny.

In halting any appearances by State officials, and demanding that executive branch lawyers accompany them, Pompeo is underscoring Attorney General William Barr’s expansive view of White House authority and setting a tone for conflicts to come.

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“I will use all means at my disposal to prevent and expose any attempts to intimidate the dedicated professionals,” Pompeo wrote.

When issuing a separate subpoena last week as part of the inquiry, the chairmen of the three House committees made it clear that stonewalling their investigation would be fought.

“Your failure or refusal to comply with the subpoena shall constitute evidence of obstruction of the House’s impeachment inquiry,” the three chairmen wrote.

Democrats often note that obstruction was one of the impeachment articles against Richard Nixon, who resigned the presidency in 1974 in the face of almost certain impeachment.

Volker played a direct role in arranging meetings between Rudy Giuliani, who is Trump’s personal lawyer, and Zelenskiy, the chairmen said.

The State Department said that Volker has confirmed that he put a Zelenskiy adviser in contact with Giuliani, at the Ukraine adviser’s request.

The former envoy, who has since resigned his position and so is not necessarily bound by Pompeo’s directions, is eager to appear as scheduled on Thursday, said one person familiar with the situation, but unauthorized to discuss it and granted anonymity. The career professional believes he acted appropriately and wants to tell his side of the situation, the person said.

Yovanovitch, the career diplomat whose abrupt recall from Ukraine earlier this year raised questions, is set to appear next week. The Democrats also want to hear from T. Ulrich Brechbuhl, a counselor at the State Department, who also listened in on the Trump-Zelenskiy call, they said.

It’s unclear whether Pompeo will comply with the committees’ request for documents by Friday. He had declined to comply with their previous requests for information.

Pompeo, traveling in Italy to meet with the country’s president and prime minister, ignored shouted question about the impeachment inquiry on Tuesday.

The House investigators are prepared for battle as they probe more deeply into the State Department to try to understand why the administration sought to restrict access to Trump’s conversations with foreign leaders.

The whistleblower alleged in an Aug. 12 letter to Congress that the White House tried to “lock down” Trump’s July 25 phone call with the new Ukrainian president because it was worried about the contents being leaked to the public.

In recent days, it has been disclosed that the administration similarly tried to restrict information about Trump’s calls with other foreign leaders, including Russia’s Vladimir Putin and Saudi Arabia’s Mohammed bin Salman, by moving memos onto a highly classified computer system.

“It’s going to be one heck of a fight to get that information,” Schiff told House Democrats during a conference call over the weekend, according to a person granted anonymity to discuss the private session.

As Trump continued to rage against the impeachment inquiry, there was little evidence of a broader White House response. And few outside allies were rushing to defend the president.

Trump has long measured allies’ loyalty by their willingness to fight for him on TV, and he complained bitterly this week that few had done so. And those who did, including House GOP leader Kevin McCarthy on CBS’ “60 Minutes,” he believed had flubbed their appearance, according to a person not authorized to publicly discuss private conversations.

Though there has been growing discontent with Giuliani in the West Wing and State Department, where some officials blame him for leading Trump into the Ukraine mess, the president continued to stand by his personal lawyer.

Giuliani, who hired former assistant special Watergate prosecutor Jon Sale a day after being hit with his own subpoena, continued to push false Biden corruption accusations and promised to fight against Democratic investigators.

The Ukraine matter remains the central focus as Democrats investigate whether Trump’s suggestion that the east European country’s new president be in touch with Giuliani and Barr to “look into” Biden amounts to a solicitation of foreign interference in the upcoming 2020 election.

The call unfolded against the backdrop of a $250 billion foreign aid package for Ukraine that was being readied by Congress but stalled by the White House.

Ukraine’s president told reporters Tuesday he has never met or spoken with Giuliani.

Zelenskiy insisted that “it is impossible to put pressure on me.” He said he stressed the importance of the military aid repeatedly in discussions with Trump, but “it wasn’t explained to me” why the money didn’t come through until September.

Not all business was halted between the White House and Congress. Even as the impeachment confrontation boiled, House Democrats briefed White House staffers on House Speaker Nancy Pelosi’s prescription drug legislation. Lowering drug costs is a top policy priority for both the speaker and the president. Joe Grogan, a top Trump domestic policy adviser, called it a “very productive start.”

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Associated Press writers Matthew Lee in Rome; Angela Charlton in Kyiv, Ukraine; and Ricardo Alonso-Zaldivar in Washington contributed to this report.

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