Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE will postpone his Friday vice presidential announcement following a deadly attack in France Thursday.

"In light of the horrible attack in Nice, France, I have postponed tomorrow's news conference concerning my Vice Presidential announcement," Trump said in a tweet.

In light of the horrible attack in Nice, France, I have postponed tomorrow's news conference concerning my Vice Presidential announcement. — Donald J. Trump (@realDonaldTrump) July 14, 2016

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Trump was expected to reveal his vice presidential choice, widely believed to be Indiana Gov. Mike Pence, at an 11 a.m. news conference.

In an interview on Fox News's "The O'Reilly Factor," Trump also seemed doubtful about a scheduled "60 Minutes" appearance with his running mate Friday in light of the attack.

Trump said Thursday evening, as news of the attack was breaking, that he was still making a final decision.

A truck reportedly filled with arms and explosives drove into a large crowd of people celebrating Bastille Day. Dozens were killed and many more injured.

Trump called the attack "horrific," asking, "When will we learn? It is only getting worse."