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Good Thursday morning. Donald J. Trump‘s heated back-and-forth in Iowa on Tuesday with a respected anchor for a Spanish-language station was a clear display of Mr. Trump’s quirks, but it also highlighted the rising tension his statements and policies on immigration have caused in the party. And a group with ties to Hillary Rodham Clinton is about to pounce.

The immigration ad wars have arrived, at least digitally.

Priorities USA, the “super PAC” supporting Mrs. Clinton, has released a digital ad that uses Mr. Trump’s statements to paint the entire Republican presidential field as hostile toward immigrants, focusing in particular on Jeb Bush and Gov. Scott Walker of Wisconsin.

The super PAC will start airing the 30-second spot, titled “This Is the Republican Party,” in Colorado, Florida and Nevada, states with large Hispanic populations.

It makes a clear suggestion that there is no daylight between Mr. Trump and the 16 other candidates. The ad opens with Mr. Trump’s announcement speech in June, in which he said many Mexican immigrants were “rapists.” The video then cuts to audio of Mr. Bush using the term “anchor babies,” for which Democrats have criticized him for days. Mr. Walker makes the briefest cameo, stating the first of what became three competing positions in the last week on the question of ending birthright citizenship.

The ad buy won’t be close to what a super PAC will ultimately spend on television spots. But it signals the approach that the outside group will use in the coming months, as Republicans fight it out while Mr. Trump shows no sign of slowing down.

— Maggie Haberman

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Days after the South Carolina Republican Party announced that it would require candidates to pledge their support to the ultimate Republican nominee in order to compete in the state’s critical primary, Mr. Trump, the clear target of the Republican litmus test, is scheduled to bring his show to Greenville on Thursday morning.

Mr. Trump, the leader among Republican presidential candidates in most polls, has not ruled out a third-party bid if Republican voters change their minds between now and next year. The South Carolina party has given candidates until Sept. 30 to register their candidacy, an application that now must include a form with a signed pledge to “hereby affirm that I generally believe in and intend to support the nominees and platform of the Republican Party in the Nov. 8, 2016, general election.”

Asked by reporters this week whether he intended to follow suit, Mr. Trump said his campaign was “looking into it.” Mr. Trump, the real estate developer/reality show celebrity/favorite of the Republican base, was alone among candidates on a crowded debate stage this month to raise his hand when asked who would not rule out a third-party bid, a move criticized by his rivals and party leaders, even if it seemed to have little effect on his poll numbers.

— Jason Horowitz

And Mrs. Clinton‘s use of a personal email server while at the State Department, the Democratic National Committee’s debate schedule, and the potential of a campaign by Vice President Joseph R. Biden Jr. are all likely to be part of the discussion at the committee’s meeting in Minnesota, which starts Thursday.

Dozens of Democratic National Committee members are flocking to the state, including most of the candidates themselves, for the summer meeting, where the party will conduct its official business.

President Obama and former Presidents George W. Bush and Bill Clinton are coming to New Orleans on consecutive days to commemorate the 10th anniversary of Hurricane Katrina.

Mr. Obama will be the first to arrive, touching down at Louis Armstrong New Orleans International Airport just after noon. Mr. Obama will hopscotch around the city to highlight its rebuilding efforts and give a speech to “celebrate the remarkable revival of an American city,” according to Josh Earnest, the White House press secretary.

“You know, if you think back nine and a half years ago, I don’t think anyone would have envisioned the dramatic progress that the city of New Orleans has made,” Mr. Earnest said on Wednesday. “And that’s a testament to the grit and determination of the people of New Orleans.”

But Mr. Obama will do more than celebrate the revival of New Orleans, Mr. Earnest said. He will also use the occasion to talk about the dangers of climate change, a subject that has become something of an obsession for him, by pointing out that “there is reason to be concerned about these storms getting worse and more violent,” Mr. Earnest said.

On Friday, Mr. Bush will arrive with his wife, Laura Bush. They will visit the Warren Easton Charter School, which benefited from a special fund set up by the Laura Bush Foundation for America’s Libraries.

On Saturday, Mr. Clinton, who established the Bush-Clinton Katrina Fund with former President George H.W. Bush, will headline the Power of Community gathering, the city’s signature event on the official anniversary of the storm’s landfall.

— Gardiner Harris

While campaigning in Iowa, Mrs. Clinton laid out her plan to help rural America. She also said that using the private email account at the State Department “clearly wasn’t the best choice,” even if it was allowed.

In a conference call on Wednesday, Mr. Biden told Democratic National Committee members that he was uncertain if his family had the “emotional fuel” for another presidential campaign.

And former Senator Tom Harkin, a fixture in Iowa Democratic politics for more than four decades, and a supporter of Mrs. Clinton‘s campaign, said that he did not think it would be “a wise move” for Mr. Biden to run against her, suggesting that, if elected, she could name him to a top diplomatic post instead.Mr. Harkin, who served with Mr. Biden in the Senate for nearly 25 years, called Mr. Biden “a good friend of mine — I love Joe,” but said that there were “other ways Joe can serve the country.”

Mr. Bush, Jewish Insider reports, “is in the process of reaching out to top Jewish leaders and donors to form a ‘National Jewish Leadership Team.'”

The Des Moines Register writes, “Leaked emails show that the Iowan who is Donald Trump’s new national co-chairman was throwing bombs at him as recently as last month, expressing grave misgivings about the authenticity of Trump’s religious faith and his conservatism.”

And Politico says that party leaders in South Carolina “are getting antsy” because they don’t think Senator Lindsey Graham can win the Republican nomination, but they feel they are unable to endorse anyone else.

Mrs. Clinton is building a firewall of Super Tuesday states where she hopes to clinch the nomination on March 1, when 11 contests are held, Politico reports.

Many donors who supported Mr. Obama‘s two presidential bids are not donating to Mrs. Clinton as they wait to see whether Mr. Biden jumps into the race, according to The Washington Post.

Last weekend’s lunch between Mr. Biden and Senator Elizabeth Warren of Massachusetts accelerated the talk of his possible presidential candidacy. It also put new focus on the vast differences in their records, especially in the financial services industry.

Ms. Warren is known as the scourge of big banks and credit-card companies. Mr. Biden, as the longtime representative of Delaware, was just as well known for his political ties to the financial institutions with headquarters there and for his past role in shaping industry-friendly legislation that made it harder for consumers to win bankruptcy protection.

Now, The Boston Globe reminds us that Ms. Warren, then a law professor at Harvard, wrote a bankruptcy bill critique in a 2002 Op-Ed in The New York Times in which she took Mr. Biden to task.

In the piece, she says that “Senator Joseph Biden of Delaware — where many banks and credit-card issuers are incorporated — agreed to vote with Republicans on almost all the issues that were holding up the bill.”

Significant time has passed, and perhaps the views of both have evolved, though neither the vice president’s office nor the senator’s would comment. But should he run for the White House and enlist the support of Ms. Warren, it could require serious explanations from each on the financial issues central to their images.

— Carl Hulse