When will Donald Trump announce his VP pick?

Despite Donald Trump's initial plan to announce Friday morning who he's tapped as his running mate, the candidate's campaign chairman said that after the attack in Nice, France, Trump "isn't prepared to" publicize his choice just yet.

"I think that Mr. Trump has reached a decision, but he hasn't -- he isn't prepared to announce it yet," Paul Manafort said of the veep pick, who CBS News has reported will be Indiana Gov. Mike Pence. "Until he announces it, you know, there's no formal nominee."

Manafort added that Trump was "moved" by the truck attack in Nice, which killed more than 80 people celebrating Bastille Day in the streets.

"He thought it was totally inappropriate in the aftermath of that tragedy to do something even as important as what he was going to do this morning," he continued. "So he said he wanted to just take a little time. It wasn't a matter of taking time to rethink things but it was a matter of honoring the people."

Manafort said he did expect Trump to make the announcement "this weekend," and noted that it will happen before the Republican party's national convention in Cleveland, which kicks off Monday.

"I would think it's going to happen before we go to Cleveland," he said.

The campaign had scheduled a news conference to publicly divulge Trump's running mate for 11 a.m. Friday. But the presumptive nominee later postponed his announcement in a tweet Thursday evening.

Shortly after that, Trump called in to two cable news shows for interviews with Fox News hosts Greta Van Susteren and Bill O'Reilly.

"I think it would be totally inappropriate to have a news conference on a vice presidential pick tomorrow in light of, you know, so many people dead and so many people horrifically wounded." Trump told O'Reilly.

Asked whether the terror attack influenced his VP selection, Trump denied that it had: "No, absolutely not."

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• Mike Pence
• Donald Trump