FILE - U.S. President Donald Trump speaks to the media prior to departing on Marine One from the South Lawn of the White House in Washington, March 28, 2019.
FILE - U.S. President Donald Trump speaks to the media prior to departing on Marine One from the South Lawn of the White House in Washington, March 28, 2019.

More than half a dozen committees of the U.S. Congress are investigating President Donald Trump, who is refusing to cooperate with most of them since the April 18 release of the Mueller report on Russian interference in the 2016 U.S. presidential election, setting up a likely court battle.

The clash between Trump and the Democrats who lead the House of Representatives committees intensified after Trump framed Special Counsel Robert Mueller’s findings as an exoneration, though Mueller neither charged nor exonerated the president.

The report, in the view of Democrats, provided plentiful leads for their further inquiries into ties between Moscow and the 2016 Trump campaign, as well as Trump’s subsequent efforts to stifle the long-running Mueller probe.

Committees are also looking into Trump’s still undisclosed taxes, potential conflicts of interest involving the sprawling business interests he has not divested since taking office, and other aspects of his turbulent presidency.

Congressional subpoenas are being issued and contempt-of-Congress citations are being considered for administration officials who are being advised by Trump to ignore the probes. Civil enforcement actions in the courts may follow.

With the 2020 election campaigns underway and casting both sides’ efforts in an increasingly partisan light, here are the key congressional committees involved.

Chairman of the House Judiciary Committee Jerrold
Chairman of the House Judiciary Committee Jerrold Nadler (D-NY) speaks during a mark up hearing on Capitol Hill in Washington, March 26, 2019.

?House Judiciary Committee

The committee’s Democratic chairman, Jerrold Nadler, is an old foe of Trump, going back years to a fight between the two New Yorkers over a large Trump real estate project in Manhattan.

Nadler’s panel has subpoenaed the Justice Department seeking the full, unredacted Mueller report and underlying evidence, as well as former White House counsel Don McGahn to testify in May.

Justice Department officials informed the committee Wednesday night that Barr would not testify Thursday before the committee to discuss Mueller’s report.

Judiciary Committee investigators are also focused on contacts Trump’s campaign had with Russia during the 2016 presidential race. Any effort to impeach Trump would likely begin in the committee.

In a book he published in 2000, Trump called Nadler “one of the most egregious hacks in contemporary politics.”

Attorney General William Barr testifies before the
Attorney General William Barr testifies before the Senate Judiciary Committee on Capitol Hill in Washington, May 1, 2019.

?Senate Judiciary Committee

The Senate Judiciary Committee was the first panel to question Barr after the release of the Mueller report.

Barr on Wednesday defended his decision to clear Trump of criminal obstruction of justice by attempting to impede Mueller’s Russia inquiry and criticized Mueller for not reaching a conclusion of his own on the issue.

Barr was asked about findings that Trump directed then-White House Counsel McGahn to ask the department’s No. 2 official, Rod Rosenstein, to fire Mueller over the special counsel’s alleged conflicts of interest. McGahn told Mueller’s investigators that he refused to carry out the president’s request.

Barr said Trump believed “he never outright directed the firing of Mueller.”

Rep. Elijah E. Cummings, the chairman of the Commi
Rep. Elijah E. Cummings, the chairman of the Committee on Oversight and Reform, presides over the last hour of testimony by Michael Cohen, President Donald Trump's former personal lawyer, on Capitol Hill in Washington, Feb. 27, 2019.

House Oversight and Reform Committee

Democratic Chairman Elijah Cummings’ panel in February held 2019’s first public hearing on Trump’s many issues, taking testimony from former Trump attorney Michael Cohen, who is scheduled to report to prison next month.

On April 2, the committee voted to subpoena Carl Kline, a former White House official, over a probe into security clearances granted by the administration.

The White House said it told Kline to ignore the committee’s subpoena. Cummings said the panel will soon vote on whether to hold Kline in contempt of Congress over the matter.

Trump has filed an unprecedented lawsuit attempting to squash a committee subpoena seeking his past financial records from Mazars USA, an accounting firm long used by Trump.

The administration has rebuffed a committee request for an interview with John Gore, an official who was involved in a decision to include a citizenship question in the 2020 census.

Also, the White House has refused a request from the panel for Trump’s top immigration aide Stephen Miller to testify.

House Ways and Means Committee Chair Rep. Richard
House Ways and Means Committee Chair Rep. Richard Neal, D-Mass., speaks during the House Ways and Means Committee on the fiscal 2020 budget on Capitol Hill in Washington, March 14, 2019.

House Ways and Means Committee

The House tax committee, led by Democrat Richard Neal, has asked the Treasury Department’s Internal Revenue Service to hand over six years of Trump’s personal and business tax returns.

Unlike presidents in recent decades, Trump has refused to disclose his returns, which committee Democrats want to obtain and review. Committee Republicans argue the committee’s request oversteps its authority.

Treasury Secretary Steven Mnuchin did not meet an April 23 committee deadline for handing over the returns and said that a “final decision” on the request would be made by May 6.

House Intelligence Committee Chairman Adam Schiff,
House Intelligence Committee Chairman Adam Schiff, D-Calif., pushes ahead with their oversight of the Trump administration at a hearing to examine "Putin's Playbook," how the Russian government works to undermine its adversaries.

?House Intelligence Committee

The committee’s chief, whom Trump has mocked as “sleazy” and “little pencil neck Adam Schiff,” is examining Russian influence in U.S. politics and whether any foreign countries hold leverage over Trump, his family, his business or his associates.

Like other panels, Schiff’s has expressed an interest in having Mueller testify about his findings.

Senate Intelligence Committee

Republican Richard Burr's committee is also looking into Russia’s role in influencing U.S. elections. The committee could release its findings later this year.

In late March, Trump adviser Jared Kushner, the president’s son-in-law, made a second appearance before the panel, according to congressional sources. Topics discussed in the closed-door sessions were not made public.

FILE - U.S. Congresswoman Maxine Waters seen at th
FILE - U.S. Congresswoman Maxine Waters seen at the 2018 Human Rights Campaign Los Angeles Dinner at JW Marriott L.A. Live in Los Angeles, March 10, 2018.

?House Financial Services Committee

Democratic Chairwoman Maxine Waters, whom Trump has also frequently mocked, is leading a probe into Trump’s ties with Deutsche Bank AG, one of the world’s largest financial institutions, as well as potential Russian money laundering through the bank. The committee oversees the financial services industry including banks.

Waters has said the House should impeach Trump.

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