President Donald Trump speaks after a signing ceremony for a trade agreement with Japan in the Roosevelt Room of the White House, Monday, Oct. 7, 2019, in Washington. (AP Photo/Evan Vucci)

President Donald Trump speaks after a signing ceremony for a trade agreement with Japan in the Roosevelt Room of the White House, Monday, Oct. 7, 2019, in Washington. (AP Photo/Evan Vucci)

WASHINGTON (AP) — As House Democrats fire off more subpoenas, the White House is finalizing a high-stakes strategy to counter the impeachment threat to President Donald Trump: Stall. Obfuscate. Attack. Repeat.

Trump aides are honing their approach after two weeks of what allies have described as a listless and unfocused response to the impeachment probe. One expected step is a letter to House Speaker Nancy Pelosi rejecting the inquiry because Democrats haven’t held a vote on the matter and moving to all but cease cooperation with Capitol Hill on key oversight matters.

Full Coverage: Trump impeachment inquiry

The strategy risks further provoking Democrats in the impeachment probe, setting up court challenges and the potential for lawmakers to draw up an article of impeachment accusing Trump of obstructing their investigations. But as lawmakers seek to amass ammunition to be used in an impeachment trial, the White House increasingly believes all-out warfare is its best course of action.

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“What they did to this country is unthinkable. It’s lucky that I’m the president. A lot of people said very few people could handle it. I sort of thrive on it,” Trump said Monday at the White House. “You can’t impeach a president for doing a great job. This is a scam.”

House Democrats, for their part, issued a new round of subpoenas on Monday, this time to Defense Secretary Mark Esper and acting White House budget director Russell Vought. Pelosi’s office also released an open letter signed by 90 former national security officials who served in both Democratic and Republican administrations, voicing support for the whistleblower who raised concerns about Trump’s efforts to get Ukraine to investigate political foe Joe Biden.

“A responsible whistleblower makes all Americans safer by ensuring that serious wrongdoing can be investigated and addressed, thus advancing the cause of national security to which we have devoted our careers,” they wrote. “Whatever one’s view of the matters discussed in the whistleblower’s complaint, all Americans should be united in demanding that all branches of our government and all outlets of our media protect this whistleblower and his or her identity. Simply put, he or she has done what our law demands; now he or she deserves our protection.”

The House Intelligence, Oversight and Foreign Affairs committees are investigating Trump’s actions pressing Ukraine to investigate Biden and his son, potentially interfering in the 2020 election. The former vice president, for his part, has accused Trump of “frantically pushing flat-out lies, debunked conspiracy theories and smears against me.” Trump also withheld hundreds of millions of dollars in military assistance to Ukraine.

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The White House has struggled to communicate its message beyond Trump’s angry public proclamations and an endless stream of tweets.

Indeed, top officials were absent from the Sunday talk shows, and the sole White House official to appear in public on Monday dodged questions on the inquiry.

Asked whether he believed the president was joking or in any way not serious when he suggested publicly that China should investigate the Bidens, Larry Kudlow, Trump’s top economic adviser, responded: “I don’t honestly know.”

Trump and his team’s initial strategy had been to try to undermine the credibility of the intelligence community whistleblower who first raised questions about Trump’s conduct with Ukraine, just as they tried to undercut special counsel Robert Mueller and his team. They stressed that the whistleblower had only second- or third-hand information and alleged that the person misrepresented the president’s efforts. But now a second whistleblower has come forward to corroborate the information, and a cache of text messages echoes the concerns that have been laid out.

As the impeachment inquiry ramps up, the White House plans to reprise its past response to congressional oversight: open scorn. The president’s aides have ignored document requests and subpoenas, invoked executive privilege — going so far as to argue that the privilege extends to informal presidential advisers who have never held White House jobs — and all but dared Democrats to hold them in contempt.

Secretary of State Mike Pompeo blew a Friday deadline for complying with a subpoena. But he said over the weekend that the State Department had sent a letter to Congress as its initial response to the request. He also indicated a new willingness to comply, saying: “We’ll obviously do all the things that we’re required to do by law.”

The letter to Pelosi has been delayed as aides work to finalize legislative and communications plans to go along with the legal strategy.

At the same time, Trump’s campaign, which has reported a fundraising surge since the impeachment inquiry, held a curiously timed briefing call with reporters Monday to trumpet its efforts to overhaul the delegate selection process to ensure there is no drama at the Republican National Convention. Trump campaign officials said the effort had nothing to do with concerns about fending off a primary challenge.

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Follow Colvin on Twitter at https:// twitter.com/colvinj , Miller at https://twitter.com/zekejmiller and Lemire at https://twitter.com/JonLemire