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Good morning.

We’re covering the reversal of President Trump’s decision to hold a gathering of world leaders at one of his properties, today’s election in Canada, and the reopening of the Museum of Modern Art in New York.

Before his country’s incursion into northern Syria, President Recep Tayyip Erdogan of Turkey voiced a larger ambition: pursuing a nuclear weapon.

With Turkey in confrontation with its NATO allies, his comments have taken on new meaning.

The country already has the makings of a bomb program — uranium deposits and research reactors, as well as a long-delayed reactor under construction. Experts said it would take several years to get to a weapon (unless Mr. Erdogan bought one).

About 50 American nuclear weapons are kept at an air base that belongs to Turkey. If U.S.-Turkish relations deteriorated, access to that base would not be assured.

Related: The U.S. accelerated a withdrawal of forces from northern Syria today, although Defense Secretary Mark Esper said a small force of American troops could remain in order to prevent oil fields from falling into the hands of the Islamic State.

Another angle: The Kurdish commander of the Syrian force that once helped the U.S. fight the Islamic State issued a warning. “There will be ethnic cleansing of the Kurdish people from Syria, and the American administration will be responsible for it,” he said.

The Daily: Today’s episode is about the families of Islamic State fighters who have been held in Kurdish-controlled camps in Syria.

President Trump dropped his plan to host next year’s Group of 7 meeting at one of his properties after Republicans and Fox News personalities expressed disapproval.

“I think there was a lot of concern,” said Representative Tom Cole, Republican of Oklahoma. “I’m not sure people questioned the legality of it, but it clearly was an unforced political error.”

Mick Mulvaney, the acting White House chief of staff who announced the selection of Trump National Doral near Miami, said on Sunday that the president “was honestly surprised at the level of pushback.”

Related: Mr. Mulvaney also acknowledged that his news conference last week, during which he said the Trump administration had tied military aid to investigating Democrats, was not “perfect.”

Canadians are voting today to decide a tight race between the Liberal Party of Mr. Trudeau, who is seeking his second term as prime minister, and the Conservatives.

Mr. Trudeau was revealed last month to have dressed in blackface and brownface when he was younger, adding to critics’ broader accusation that his liberal image is merely a veneer.

Former President Barack Obama endorsed Mr. Trudeau last week, but the prime minister’s approval rating is about 35 percent, half of what it was during his first full year in office.

Related: If voter turnout is low, smaller parties may end up in a powerful position.

The poorest country in the Western Hemisphere has been trapped for years in political and economic dysfunction, but many Haitians say the current crisis is worse than anything they’ve experienced.

Demonstrations began more than a year ago after the government was accused of misappropriating billions of dollars meant for social development projects. At least 30 people have been killed since the protests intensified last month, according to the United Nations.

Background: President Jovenel Moïse, who has had the support of the U.S., took office in February 2017 after an election that was marred by delays and allegations of voter fraud.

Quotable: “There is no hope in this country,” said Stamène Molière, an unemployed secretary. “There’s no life anymore.”

The Solomon R. Guggenheim Museum in New York, designed by Frank Lloyd Wright, turns 60 this month and has been drawing onlookers since before it opened. It’s pictured above in 1958.

Our architecture critic looked back on the legacy of “a landmark of sculptural architecture.”

Drawdown in Afghanistan: The number of U.S. troops in the country fell by about 2,000, to roughly 12,000, over the past year, the top American commander there said today.

Opioid trial: The first federal case over major drug companies’ role in the epidemic is set to begin today in Cleveland, after last-minute settlement talks faltered. Here’s a guide to the proceedings.

The 2020 race: Elizabeth Warren, who has sidestepped questions about how she would pay for “Medicare for all,” said she would release a plan for doing so in the coming weeks. Separately, Bernie Sanders received one of the most coveted endorsements in the Democratic Party: that of Representative Alexandria Ocasio-Cortez.

Path to Brexit success: Prime Minister Boris Johnson has been thwarted several times, but he has a surprisingly good chance of getting a deal through Parliament this week to lead Britain out of the European Union.

Snapshot: Above, demolition crews tried to take down two cranes on Sunday at a construction site in New Orleans, but only one came down completely. Three workers were killed and more than 20 people were hurt this month when portions of the building collapsed.

N.F.L. results: The San Francisco 49ers are 6-0 for the first time since 1990. Here’s what else we learned from Week 7.

Metropolitan Diary: In this week’s column, wondering where the F will stop next, going to the game, and more reader tales of New York City.

What we’re watching: This TED Talk by the marine biologist Ayana Elizabeth Johnson. Lynda Richardson, a Travel editor, says, “It is a love story for the coral reef crisis, but even more an ode to her beloved parrotfish, a creature with the amazing ability to ‘poop white sand’ and make changes in its sex and wardrobe.”

“Quid pro quo” — Latin for “something for something” — is a legal phrase describing an arrangement where you give someone something they want, but only if that person gives you what you want.

It’s most commonly seen in federal bribery trials, where politicians use the power of their office to help someone in exchange for some sort of personal enrichment. It can also appear in sexual harassment lawsuits.

Since the start of the impeachment investigation, Mr. Trump has turned “no quid pro quo” into a rallying cry. Mr. Mulvaney’s admission that one might have taken place could have enormous consequences.

That’s it for this briefing. See you next time.

— Chris

Thank you
Melina Delkic helped compile today’s briefing. Mark Josephson and Eleanor Stanford provided the break from the news. You can reach the team at briefing@nytimes.com.

• We’re listening to “The Daily.” Today’s episode is about the effort to extract detainees from camps in northern Syria.
• Here’s today’s Mini Crossword, and a clue: Poem with a 5/7/5 structure (five letters). You can find all our puzzles here.
• “Still Processing,” a weekly podcast from The Times, tackles some of culture’s thorniest questions. Here’s how it comes together.


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