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Photo: Geoff Livingston/Getty Images

Many 2020 candidates have been flirting with the idea of expanding the Supreme Court, while others have fully rejected the idea.

Background: The Constitution allows Congress to change the number of justices that sit on the court. Historically, the number has flexed 7 times. In recent years, Democrats have had little success pushing their picks through: Republicans blocked President Obama's nomination of Merrick Garland following the death of Justice Antonin Scalia, and pushed Justice Brett Kavanaugh's controversial nomination through.

Who is open to court packing:

Mayor Pete Buttigieg: The Indiana mayor was among the first candidates to talk about court packing. Buttigieg told The Intercept he would work on restructuring the Supreme Court, expanding it to 15 justices, in which 5 justices would be selected by the Court through an unanimous vote. Buttigieg said that would help "de-politicize" the Court.

Sen. Kamala Harris (D-Calif.) said: "We are on the verge of a crisis of confidence in the Supreme Court. We have to take this challenge head on, and everything is on the table to do that," per Politico. She said she is open to the idea of court packing.

Sen. Elizabeth Warren (D-Mass.): Warren said the focus on the Supreme Court should be to reform and depoliticize it, reports Politico. She is open to expanding the Supreme Court.

Tech executive Andrew Yang said expanding the Supreme Court "isn't something that should be ruled out," per the Washington Post. On his campaign website, Yang is more focused on limiting how long justices can serve, proposing an 18-year limit.

Mayor Wayne Messam (D-Fla.): is open to increasing the number of Supreme Court justices, but also said: "Make no mistake, the court is already packed," reports the Washington Post.

Sen. Cory Booker (D-N.J.) says he is "taking nothing off the table," and that "our Supreme Court is way out of whack."

Gov. Steve Bullock (D-MT): "I’m open to discussion on different ways we can depoliticize the Supreme Court, including expanding the court."

Who opposes court packing:

President Trump said he "wouldn't entertain" the idea of court packing, reports Reuters. Trump said Democrats have only proposed the idea because "they want to try to catch up."

Former Vice President Joe Biden: "No, I’m not prepared to go on and try to pack the court, because we’ll live to rue that day."

Sen. Bernie Sanders (I-Vt.): Sanders is against court packing, but believes in imposing term limits, reports Reuters. He said, "My worry is that the next time the Republicans are in power they will do the same thing."

Former HUD Secretary Julián Castro told the Washington Post he is open to reforming the Supreme Court, but not adding more justices.

Former Rep. John Delaney (D-Md.) opposes court packing, and has even warned Democrats about the idea, suggesting it would lead to "partisan warfare." Instead, he supports reforms and term limits.

Marianne Williamson told WaPo she doesn't support this idea.

Sen. Michael Bennet (D-Colo.): Bennet told WaPo he does not support court packing.

Rep. Tulsi Gabbard (D-Hawaii) noted to the WaPo she does not support the idea.

Joe Sestak told WaPo he does not support the idea.

Mixed messages:

Former Rep. Beto O'Rourke (D-Tex.): At a rally in Iowa, O'Rourke said court packing is an idea that should be explored. He also proposed doubling the number of seats by 5 to 10. O'Rourke proposed Republicans and Democrats select 5 justices each and the last 5 be selected independently by the justices. But O'Rourke has also told the Post he does not support court packing.

Who hasn't mentioned it:

Sen. Amy Klobuchar (D-Minn.): While Klobuchar hasn't mentioned court packing, she told CBS she is more focused on placing qualified judges in higher courts.

Go deeper: Everything you need to know about every 2020 presidential candidate

Go deeper

Pakistan PM will "absolutely not" allow CIA to use bases for Afghanistan operations

Pakistan will "absolutely not" allow the U.S. Central Intelligence Agency to use bases on its soil for cross-border counterterrorism missions after American forces withdraw from Afghanistan, Prime Minister Imran Khan tells "Axios on HBO" in a wide-ranging interview airing Sunday at 6 pm ET.

Why it matters: The quality of counterterrorism and intelligence capabilities in Afghanistan is a critical question facing the Biden administration as U.S. forces move closer to total withdrawal by Sept. 11.

5 hours ago - World

U.S. wants nuclear deal done before Iran's new president takes power

Iranian negotiatorAbbas Araghchi arrives at the Grand Hotel Wien for the nuclear talks. Photo: Joe Klamar/AFP via Getty Images

The Biden administration wants to finalize a deal with Iran to return to the 2015 nuclear deal in the six weeks remaining before a new Iranian president is inaugurated, a U.S. official tells Axios.

Key quote: The official said it would be "concerning" if talks dragged on into early August, when Iran's transition is due to take place. "If we don't have a deal before a new government is formed, I think that would raise serious questions about how achievable it's going to be," the official said.