As the Supreme Court of the United States convened the first Monday of this month, there was talk of big cases involving abortion, guns, gay rights, immigration, perhaps even affirmative action.

Another issue may trump all of them; it's a terrible pun, but multiple cases affecting Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's unprecedented claims of personal and presidential prerogatives may affect this court and American politics for years to come.

Two justices, in particular, would feel the heat: Chief Justice John Roberts, often the swing man as the court moves to the right, and Associate Justice Brett Kavanaugh Brett Michael KavanaughTrump plans to pick Amy Coney Barrett to replace Ginsburg on court Collins trails challenger by 4 points in Maine Senate race: poll SCOTUS confirmation in the last month of a close election? Ugly MORE, barely confirmed last year after charges of sexual misconduct, and depicted by critics as a Trump lackey.

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The cases that could reach the court include: the House of Representatives and — separately — New York prosecutors seeking financial and tax records from his accountant; the House Ways and Means committee getting his tax returns from the Internal Revenue Service; and the House trying to enforce subpoenas for testimony and information that are central to the impeachment inquiry.

More than Richard Nixon or any other President, Trump is stonewalling at every step.

The first case reaching the Supreme Court may be whether his accounting firm must turn over his financial records to Congress and the Manhattan prosecutor. Trump is vehemently resisting. A federal appeals court has already ruled against the president on the House request.

The New York investigation was triggered by charges from the president's former personal attorney, Michael Cohen Michael Dean CohenAppeals court appears skeptical of Trump's latest argument against tax returns subpoena Judge orders Eric Trump to comply with New York AG's subpoena before Election Day A huge deal for campaign disclosure: Trump's tax records for Biden's medical records MORE, that Trump paid off a former mistress to buy her silence during the 2016 campaign.

In response, Trump's lawyers have made a sweeping claim that a sitting president — any sitting president — cannot so much as be investigated while in office.

In fact, Trump's lawyer told the astonished panel that even if Trump followed through on one of his more famous bragging points and in fact shot someone “in the middle of 5th Ave.,” he couldn't even be investigated — as long as he was president.

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Previously, a Justice Department opinion said that an incumbent president cannot be indicted — though that's never been legally tested.

But the notion that a president can't even be investigated is stunning. Under that theory, there would have been no Watergate investigation. That flies in the face of earlier decisions. In 1997, the Supreme court ruled unanimously that Bill Clinton William (Bill) Jefferson ClintonHarris: Ginsburg 'absolutely' cleared the path for me Anxious Democrats amp up pressure for vote on COVID-19 aid Barr's Russia investigator has put some focus on Clinton Foundation: report MORE could not delay a civil suit against him until he was out of office.

In this Trump case, a federal judge had pointedly rejected Trump’s claim as “repugnant” — and that case is on appeal now.

If the court of appeals in New York upholds that ruling the president likely will appeal both decisions to the U.S. Supreme Court. One way out for the High Court is to refuse to hear the appeals. That will infuriate the right wing.

Another case involves the request by House Ways and Means Committee chairman Rep. Richard Neal Richard Edmund NealOn The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package House Democrats to include more aid for airlines in coronavirus package The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (D-Mass.) for the Internal Revenue Service to give him Trump's tax returns. This committee has oversight responsibilities over the IRS and, as Neal notes, this has been exercised, under both Republican and Democratic chairs and has never been denied.

The IRS automatically audits the tax returns of the president and vice president — and has since the 1970s. Congress has every right to see this is being done properly.

Trump promised he'd release his tax returns, and then repeatedly refused. What he's trying to hide may be pertinent to any number of matters.

The law is very clear: The IRS “shall furnish” any returns that the committee chair requests.

Finally, there are a plethora if demands for testimony and documents leading to the impeachment inquiry. The Trump White House has refused to comply and ordered others to do likewise.

Again, Trump has a weak case.

In 1974, Richard Nixon refused to comply with requests for his White House tapes during the impeachment process. The Supreme Court, with a majority of Republican-appointed judges, unanimously ruled against the president.

Earlier decisions left no doubt that Congress has the authority to compel witnesses to testify and produce documents if the probe is authorized by Congress, if it involves a “valid legislative purpose” (though it doesn't have to involve specific legislation), and the subpoena is relevant to the inquiry.

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These conditions are a slam dunk as soon as the House officially sanctions an impeachment process; the only question is when, not whether.

There may be a race between court tests and impeachment. But on matters of such gravitas, the legal tests can move swiftly. When Nixon tried to block the New York Times and other papers from publishing the Pentagon papers, a classified account of the Vietnam War, the court ruled against the administration in less than two and half weeks. The White House tapes case, in 1974, was argued on July 9 and the decision was handed down July 24.

If these cases reach the Supreme Court in the next few months, Chief Justice Roberts, sometimes seen as the swing vote now that the court has moved to the right, will be on the spot. He's both an institutionalist and a politically astute conservative aware of the uproar that a politically directed decision will cause.

Justice Kavanaugh may be under more scrutiny. His public standing has never recovered from his inflammatory confirmation. He may welcome an opportunity to break with Trump on a high stakes case.