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Rep. Ro Khanna and Sen. Bernie Sanders at a press conference following a vote on ending U.S. military involvement in the war in Yemen

The U.S. still backs Saudi Arabia's fight in Yemen, even though Congress voted to end that support. Now, progressive Rep. Ro Khanna (D-Calif.) is pushing Democratic leaders to turn to the Supreme Court to help enforce Congress' will.

Why it matters: Congress' resolution seeking to end U.S. involvement in Yemen passed with support from diverse ideological factions — from moderates to Bernie Sanders to Rand Paul, only to meet a veto from President Trump.

That has united a similarly diverse group of law professors, who say Trump usurped Congress' authority over matters of war when he vetoed the resolution and that the House should sue him for it.

  • "I think the Speaker is seriously considering pursuing the lawsuit and will make the correct next step for the people of Yemen and our constitutional integrity," Khanna told Axios. "Yemen can’t wait, and it is my hope that this legal challenge to Trump’s veto moves forward."

"If Nancy Pelosi gets a majority behind her to bring suit, this is a moment of truth for the Supreme Court," said Yale law professor Bruce Ackerman, who's leading the charge on this legal theory.

The response: "We continue to consider all viable options to end this humanitarian crisis," Pelosi's office said.

The big picture: The Constitution gives Congress the power to declare war, and in the wake of Vietnam, Congress spelled out more detailed rules about presidential unilateral power. In Ackerman's view, the Yemen vote is a referendum on whether those rules still apply.

The big question: The Supreme Court has said presidential power is "at its lowest ebb" when exercised in a way that's "incompatible with the ... will of Congress." If the House sues over Trump's Yemen veto, the central question would be whether that's what happened here, said Scott Anderson, a Brookings fellow and former State Department lawyer.

  • Ackerman says it obviously is. Trump's veto "defied fundamental principles of constitutional law," he and 12 other law professors wrote in a letter to Pelosi.

Between the lines: The case is likely a long shot, given the Supreme Court's ideological balance as well as Chief Justice John Roberts' traditional reluctance to get in the middle of disputes between the other two branches. 

  • The courts would have to toss aside a decades-old interpretation of certain parts of Congress' war powers, Anderson said, adopting a new standard for America's work with other countries' militaries. 
  • "Courts have been really resistant and reluctant to take up these questions," he said.

What's next: If Congress wants to force the U.S. out of Yemen, its best bet might be to keep trying with different legislative vehicles, Anderson said.

  • That could include the annual Defense Authorization Bill, a must-pass omnibus that will get rolling in the Senate over the summer.

Go deeper

Sen. Sheldon Whitehouse under scrutiny for elite club affiliations

Sen. Sheldon Whitehouse during a Senate hearing on Capitol Hill in February. Photo: Susan Walsh-Pool/Getty Image

Sen. Sheldon Whitehouse (D-R.I.) said in a statement Wednesday that he is a member of an exclusive Rhode Island sailing club that lacks diversity.

Why it matters: Whitehouse has repeatedly spoken out against systemic racism and come under scrutiny this week for his family's affiliation with elite clubs. This is the second such club accused of lacking diversity that the senator has been linked to in recent days

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Scoop: Border Democrats want migrants vaccinated

Rep. Filemon Vela (D-Tex.) Photo: Chip Somodevilla/Getty Images

Some Democrats representing border districts want President Biden to vaccinate migrants crossing into the U.S. — especially if he lifts public health restrictions that have prevented them from claiming asylum on American soil.

Why it matters: Inoculating migrants treads a fine line of protecting the U.S. population while possibly incentivizing more migration with the offer of free COVID-19 vaccines. Republicans are likely to pounce on that.

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State Dept. fears Chinese threats to labor auditors

A space for media is designated by Chinese authorities near a mosque in the Xinjiang region of China. Photo: Greg Baker/AFP via Getty Images

The State Department is concerned organizations performing supply-chain audits in China are coming under pressure from Chinese authorities.

Why it matters: U.S. law prohibits importing products made through forced labor, but it's becoming increasingly difficult to verify whether products from China are tainted.