Merrit Kennedy

Updated at 5:25 p.m. ET

President Trump said on Twitter Thursday morning that "if Mexico is unwilling to pay for the badly needed wall, then it would be better to cancel the upcoming meeting" with Mexican President Enrique Peña Nieto.

Shortly afterward, news broke that Peña Nieto had done just that. He also took to Twitter and said he would not attend Tuesday's planned visit to Washington, D.C., without giving a reason.

In one of his last moves in office, President Obama has commuted the 35-year prison sentence of Chelsea Manning, the Army private who leaked a massive trove of military secrets to WikiLeaks.

The former intelligence analyst's prison sentence has been shortened to expire on May 17, 2017, according to a statement from the White House.

Noor Salman, the wife of Orlando nightclub shooter Omar Mateen, has been arrested on federal charges.

Salman is charged with "Aiding and Abetting by providing material support to a terrorist and Obstruction of Justice," Orlando Police Chief John Mina said in a statement.

On June 12, 2016, 49 people died when Mateen opened fire at Pulse in the deadliest mass shooting in modern U.S. history. He was killed in a firefight with police.

European leaders are expressing alarm after U.S. President-elect Donald Trump said the EU is "basically a vehicle for Germany" and reiterated his view that NATO is "obsolete."

Speaking about the EU, Trump said "people want their own identity," and therefore "I believe others will leave." He has previously applauded the U.K.'s decision last year to depart from the 28-nation bloc and repeated that sentiment, saying that "I think Brexit is going to end up being a great thing."

Updated 5:30 p.m. ET

The intelligence report on Russia's interference in the U.S. elections concludes that Russian President Vladimir Putin personally ordered an "influence campaign" that aimed to help President-elect Donald Trump.

Editor's note: An image below shows Ambassador Andrei Karlov on the ground after he was shot.

Russia's ambassador to Turkey has died after he was shot Monday evening at an art exhibition in the capital, Ankara, Russian Foreign Ministry spokeswoman Maria Zakharova said in comments broadcast on Russian state television.

A $25 million settlement agreement has been reached in the civil fraud lawsuits against President-elect Donald Trump and Trump University, according to New York's state attorney general.

Police say 5 people were killed after a shooter opened fire inside a Macy's at a shopping mall in Burlington, Washington on Friday evening.

Authorities are searching for the suspected shooter, who they say left the scene at Cascade Mall before police arrived. He was last seen walking toward a nearby interstate highway. Skagit County's Department of Emergency Management cautioned people to stay indoors and "stay alert."

A day after an explosion in Manhattan injured 29 people, New York authorities said all injured people have all been released from hospitals. They say they do not have evidence the blast is linked to international terrorism.

The names of each of the nearly 3,000 victims of the Sept. 11 attacks were read at a ceremony at the Sept. 11 memorial plaza, at the World Trade Center site in New York City. This marks the 15th anniversary of the attacks.

Family members came forward to name and honor their relatives who died at the World Trade Center, the Pentagon and on Flight 93. The event also commemorated the victims of the 1993 World Trade Center bombings.

Updated 2 a.m. ET, Sept. 12

Democratic presidential candidate Hillary Clinton was diagnosed with pneumonia on Friday, according to a statement issued late Sunday afternoon by her physician, Lisa R. Bardack.

The Clinton campaign provided the statement after Clinton was examined at her home in Chappaqua, N.Y. On Sunday morning, Clinton abruptly left a Sept. 11 commemoration ceremony in New York City. Her campaign later said she had "felt overheated."

Dr. Bardack's statement reads:

Louisiana is entering recovery mode after devastating flooding killed 13 people and damaged at least 60,000 homes across 20 parishes.

But as Louisana Gov. John Bel Edwards told CNN, that process is "going to take many months." He added that even though this flooding was "unprecedented and historic," many are "just now realizing how significant it was."

Rescue efforts are underway in Southeast Louisiana as the state is drenched and battered by what the governor has called an "unprecedented and historic flooding event." He has declared a state of emergency and three people have been killed by the floods.

Night owls and stargazers, get ready for something spectacular on Thursday.

The annual Perseid meteor shower, already one of the most reliably impressive celestial events, promises to be especially good this year.

The Perseid shower happens every year in August "when Earth ventures through trails of debris left behind by an ancient comet," according to NASA.

A hot air balloon carrying at least 16 people crashed in central Texas after catching fire, and the Caldwell County Sheriff said "it does not appear there were any survivors."

Sheriff Daniel C. Law said in a statement that "investigators are determining the number and identities of victims at this time."

Three weeks after authorities identified 25-year-old Micah Johnson as the shooter who killed five policemen in Dallas, the military has released new details about his bizarre behavior while serving in Afghanistan.

According to a 2014 military investigation, Johnson stole underwear from an unnamed female service member and repeatedly sexually harassed her. In his sleeping bag, the military found grenade launcher ammunition and prescription medication belonging to a fellow soldier.

For decades, Japanese fishermen have told stories about the existence of a dark, rare beaked whale that they called karasu — the "raven."

But now, scientists say they have genetic proof to back up these tales. Long mistaken for its relative, the Baird's beaked whale, scientists say it represents an entirely new species.

The International Olympic Committee has announced that it will not impose a blanket ban on the entire Russian team from the upcoming Summer Olympics in Rio de Janeiro despite evidence of state-sponsored doping.

Instead, it has called on sports federations to carry out assessments on individual athletes to determine whether they can compete.

The decision is an attempt to balance "the desire and need for collective responsibility versus the right to individual justice of every individual athlete," IOC President Thomas Bach said in a teleconference with reporters on Sunday.

A rape survivor is suing Texas' Harris County after she was jailed for more than a month and subjected to beatings and "psychological torture."

According to court documents, she had suffered a mental breakdown while testifying against her rapist, and authorities checked her into the general population at Houston's Harris County Jail because they feared she would flee before finishing her testimony.

Donald Trump has officially introduced Indiana Gov. Mike Pence as his vice presidential running mate.

"I've found the leader who will help us deliver a safe society and a prosperous, really prosperous society for all Americans," Trump said at a campaign event in New York Saturday. "Indiana Governor Mike Pence was my first choice."

Trump spoke at length about his admiration for Pence's record in Indiana. "He's really got the skills of a highly talented executive," he said.

Pages