After six months in power, House Democrats have issued a series of high-profile subpoenas as part of their sprawling investigations into President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE and his administration.

Democrats have gone after key figures like former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE as well as top-level administration officials, both current and former, as they seek to obtain documents and compel testimony.

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The White House has fought back against those oversight efforts, intervening in multiple cases by blocking Trump officials from providing testimony or documents related to their time in the administration and claiming immunity for senior advisers.

Here are the key individuals, entities and documents subpoenaed by House committees as part of their multi-pronged investigations into Trump, his administration and his businesses.

Judiciary Committee

Robert Mueller

Democrats spent weeks negotiating with the former special counsel as they sought his public testimony following April’s release of his Russia report. But two top committees eventually resorted to subpoenaing Mueller.

House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) and Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power Rubio on peaceful transfer of power: 'We will have a legitimate & fair election' MORE (D-Calif.) jointly announced last month that Mueller will testify publicly before the two panels on July 17. His appearance is expected to be a major spectacle on Capitol Hill, possibly rivaling some of the biggest hearings in congressional history.

While Mueller has stated he will discuss matters beyond his 448-page report, Democrats are still buzzing with anticipation and hope that the former FBI chief will reveal aspects of the president’s conduct -- particularly episodes examined for possible obstruction -- as laid out in Mueller’s Russia report.

Don McGahn

In late April, Nadler went after Don McGahn, subpoenaing the former White House counsel to turn over documents and appear for a public interview.

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McGahn, however, defied the subpoena by following a White House instruction that he not testify. He also did not provide the panel with the requested documents.

Democrats view McGahn as a crucial witness, particularly because of his testimony to Mueller on Trump’s potential obstruction of the Russia investigation. Nadler has said the committee would look to “enforce” the subpoena even if it means going to court.

The White House has argued that McGahn and other top advisers are “absolutely immune” from compelled congressional testimony about their time in the West Wing -- an argument that may soon be tested in court.

Hope Hicks Hope Charlotte HicksSenate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Cuomo turned down Trump invitation to participate in April press briefing: report Trump shakes up White House communications team MORE

Amid an already exacerbated fight with the White House, Nadler subpoenaed former White House communications director Hope Hicks on May 21st to testify before his committee and provide documents.

Hicks, who also worked on Trump’s 2016 campaign, agreed to testify behind closed doors for a transcribed interview in late June, making her the first big witness to appear on Capitol Hill amid the Democratic probes.

But the White House instructed Hicks not to turn over specific documents or discuss her work as it related to her time in the Trump administration.

White House lawyers who accompanied Hicks during her interview repeatedly blocked her from answering certain questions, according to a released transcript of her interview, further fueling Democrats’ accusations that Trump is obstructing their probes. Hicks did, however, discuss her time on the Trump campaign.

Annie Donaldson

Annie Donaldson, McGahn’s former chief of staff, was subpoenaed on the same day as Hicks. And the White House gave her the same instructions: Don’t discuss -- or provide records -- anything relating to your time in the administration.

Nadler announced last month that Donaldson has agreed to testify in person, in November, about the key events she observed while serving in the Trump administration. The deadline for her testimony was extended due to a pregnancy that makes it difficult for her to travel or testify for long periods of time.

Under the agreement, Donaldson must also provide written answers within a week of receiving them from the committee.

Intelligence Committee

Michael Flynn

In mid-June, Schiff issued a subpoena for Michael Flynn, the president’s former national security adviser who ultimately went on to cooperate with Mueller’s investigation.

Schiff has demanded that Flynn, who worked on Trump’s campaign before briefly serving in the administration, provide “documents and other materials” by June 26 and appear before the committee for sworn testimony on July 10. The panel has not said whether Flynn met the June 26 deadline. Any testimony would likely take place behind closed doors.

In December 2017, Flynn pleaded guilty to lying to federal investigators about his contacts with Russia’s ambassador to the U.S. and agreed to cooperate in Mueller’s investigation. He has not yet been sentenced.

Rick Gates Rick GatesFive takeaways on Bannon's indictment Senate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Top Mueller prosecutor: 'We could have done more' in Russia investigation MORE

Schiff separately subpoenaed Rick Gates, stating that he had no choice but to compel the former Trump campaign aide to turn over documents and provide testimony because he had refused to cooperate with the committee voluntarily.

Gates, who served as Trump’s former deputy campaign manager, received his subpoena on the same day the committee issued a congressional order for Flynn. The panel also set the same deadline for Gates -- June 26 for documents and July 10 to provide sworn testimony. It’s not clear if the first deadline was met.

Gates, who pleaded guilty in February 2018 to making false statements and to a conspiracy charge, agreed to cooperate with Mueller’s probe. He is still cooperating with the government and has yet to be sentenced.

Felix Sater

Schiff issued a subpoena for Felix Sater in late June after the president’s onetime business associate did not appear for a scheduled closed door interview with the panel.

The committee had requested Sater’s testimony as part of its Russia investigation. In particular, Democrats on the panel wanted to question Sater about his involvement in discussions to build a Trump real estate property in Moscow during the 2016 presidential campaign. The plans never came to fruition, but the talks still attracted scrutiny by Mueller.

Sater’s attorney, Robert Wolf, said in a June 21 statement that Sater was prevented from appearing due to “unexpected health reasons.”

Deutsche Bank, Capital One

Schiff and House Financial Services Committee Chairwoman Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.) issued separate subpoenas to Deutsche Bank and Capital One in mid-April, as part of a joint effort to obtain Trump’s personal and business financial records from his longtime lender.

Trump responded by suing the financial institutions in an effort to prevent them from providing the documents covered by the subpoenas. But a federal judge in New York delivered a blow to the president in May by ruling that the two banks can provide Trump's financial records to House Democrats. Trump quickly filed appeals in both cases.

Oversight and Reform Committee

Carl Kline

Cummings in early April issued a subpoena to White House Personnel Security Director Carl Kline seeking to compel his testimony after a whistleblower came forward with allegations about the administration’s security clearance process.

The whistleblower, Tricia Newbold, told committee staff that her higher-ups at the White House overruled her and other career officials more than two dozen times by granting clearances to administration officials and contractors despite concerns about "disqualifying issues" in their backgrounds.

John Gore

Cummings also issued a subpoena to Principal Deputy Assistant Attorney General John Gore in early April as part of the committee’s investigation into why the Trump administration wants to add a citizenship question to the 2020 census.

The Commerce and Justice Departments announced Tuesday the government would move forward with printing census materials without the citizenship question – a statement Trump contradicted Wednesday, sowing confusion about whether it would appear on the decennial survey. Later on Wednesday, a lawyer with the Department of Justice said agency officials have been ordered to determine whether there is a way the administration can still include a citizenship question on the census. The matter has yet to be resolved.

The drama followed a 5-4 ruling by the Supreme Court that the question could not be added for the time being.

Cummings issued the subpoena for Gore on April 2, the same day the committee separately sent orders for Kline.

The committee said it will hear from Census Bureau Director Steven Dillingham on July 24.

Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE

Oversight and Reform Committee Chairman Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.) issued a subpoena for Kellyanne Conway in late June, after the White House counselor did not appear voluntarily at a hearing focused on allegations that she ran afoul of the Hatch Act.

The committee voted largely along party lines to authorize the order to compel her testimony, which was issued on the same day as the vote, a committee spokesperson confirmed.

Last month, the Office of Special Counsel (OSC) sent a report to Trump that said Conway repeatedly violated the Hatch Act by discussing Democratic presidential candidates while appearing as a White House official for television interviews. The Hatch Act bars federal officials from using their positions to advocate for certain candidates.

When Democrats pressed to interview her, the White House intervened, blocking Conway from appearing for public testimony and citing a "long-standing precedent" in which presidential administrations decline requests to have presidential advisers give congressional testimony.

Mazars

Cummings issued a subpoena in mid-April seeking the president’s financial records from the accounting firm Mazars.

A district judge later upheld the congressional subpoena for the records, delivering a blow to the president. Trump’s lawyers have filed an appeal, which will be decided by a three judge panel on the D.C. Circuit Court of Appeals on July 12.

Key documents

Mueller report

The House Judiciary and Intelligence committees are waging high-profile battles with the Justice Department for the full Mueller report.

Attorney General William Barr Bill BarrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs YouTube to battle mail-in voting misinformation with info panel on videos MORE, who has been subpoenaed by the Judiciary Committee for the documents, has resisted releasing grand jury material from the report to Congress, noting federal law mandates its secrecy in the absence of a court order.

Schiff has also requested access to Mueller’s full unredacted report, its underlying evidence, and counterintelligence and foreign intelligence materials generated in the course of the 22-month investigation.

While neither chairman has obtained the full report, the Judiciary panel reached an agreement with the Justice Department to receive underlying evidence on obstruction, and the department has begun producing counterintelligence and foreign intelligence files to the Intelligence panel.

Trump's tax returns

The chairman of the House Ways and Means Committee in mid-May subpoenaed Treasury Secretary Steven Mnuchin Steven Terner MnuchinOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Pelosi asks panels to draft new COVID-19 relief measure MORE and IRS Commissioner Charles Rettig to turn over six years of Trump’s tax returns.

Mnuchin and Rettig, however, did not comply with the congressional order, prompting Committee Chairman Richard Neal Richard Edmund NealPelosi asks panels to draft new COVID-19 relief measure AARP endorses Democrats' measure to overturn Trump payroll tax deferral Pelosi, Democrats unveil bills to rein in alleged White House abuses of power MORE (D-Mass.) to file a lawsuit Tuesday over their refusal, igniting what could become a lengthy court battle.

Census materials

Cummings also subpoenaed Barr and Secretary of Commerce Wilbur Ross Wilbur Louis RossTrump admin asks Supreme Court to fast-track excluding people in U.S. illegally from census Trump 'very happy' to allow TikTok to operate in US if security concerns resolved TikTok, WeChat to be banned Sunday from US app stores MORE for documents related to the administration’s desire to include the citizenship question in the 2020 census.

Barr and Ross did not comply, and the Oversight Committee voted largely along party lines to hold the two Cabinet members in contempt.

“The Attorney General and the Secretary of Commerce must now turn over all of the documents our Committee has subpoenaed on a bipartisan basis,” Cummings said Tuesday.