Donald Trump has chosen Indiana Gov. Mike Pence as his vice presidential running mate, a source with direct knowledge confirms to NPR’s Mara Liasson.

An roll-out in New York City had been planned for Friday at 11 a.m., but Trump tweeted Thursday evening that “in light of the horrible attack in Nice, France,” he was postponing that announcement.

The presumptive Republican presidential nominee’s choice of Pence gives him a younger, conservative favorite to help heal the rift within the Republican Party and ease the minds of many still skeptical of Trump

The Indiana governor emerged as a front-runner in the past week, with many of Trump’s advisers reportedly liking what the 57-year-old Republican would bring to the ticket. He’s a more cautious, less-flashy choice over the other rumored finalists — former House Speaker Newt Gingrich and New Jersey Gov. Chris Christie. He won’t run the risk of overshadowing Trump and could help him appeal to disaffected conservatives and evangelical voters.

Having served at both the state and federal level, Pence also has the political experience Trump has said he’s looking for to help him navigate Washington. A House member for 12 years, Pence was elected governor in 2012. Before entering politics, he was a conservative talk radio host and hosted a Sunday political TV show in Indianapolis. He was also president of a conservative think tank in the state, the Indiana Policy Review Foundation.

Pence has been praised for helping revive Indiana’s economy — an argument he can make on the stump with Trump. When he took office, the state’s jobless rate was at 20 percent, per CNBC, and has now fallen to 5 percent.

He became a born-again Christian in college and has talked about how his faith drives his politics, saying he’s “a Christian, a conservative, and a Republican, in that order.”

In 2015, he signed into law a controversial religious freedom bill, which spurred wide backlash and fears it would enable LGBT discrimination. Many state businesses — including the NCAA, which was readying to hold the Final Four there — said they reconsidered deals and investments.

Pence later signed a revision he said would prevent such LGBT discrimination, but many religious conservatives faulted him bending to political pressure. Earlier this week, Tony Perkins, president of the conservative Family Research Council, told NBC News that he believed Trump could “do better” with a pick “who has not capitulated on something as fundamental as religious freedom.”

Even though Pence initially endorsed Ted Cruz ahead of his state’s May 3 primary, his blessing for the Texas senator was lukewarm — he had also praised Trump. He endorsed Trump shortly after he won his state — a win that effectively ended the GOP primary after Cruz and Ohio Gov. John Kasich dropped out.

Trump campaigned with Pence in Indiana this week, and the governor was the only one of the three finalists who introduced Trump to the crowd.

“Donald Trump gets it. Donald Trump hears the voice of the American people,” Pence boasted, adding that, “We are ready to put a fighter, a builder and a patriot in the Oval Office of the United States of America.” He followed up on that appearance with tweets supportive of Trump.

The two appeared to get along well, and Trump teased the crowd in Westfield, Ind., “I don’t know if he’s going to be your governor or your vice president, who the hell knows!”

Pence will have to withdraw from his own re-election bid by noon Friday, which could help Republicans in his own state. He was locked in a tough rematch with former State House Speaker John Gregg, in part due to his falling standing in the state after the religious freedom law controversy.

Republicans will now be able to replace him on the ballot. According to the Indianapolis Star, potential replacements include Lt. Gov Eric Holcomb and Rep. Susan Brooks. Indiana House Speaker Brian Bosma and Rep. Todd Rokita have already signaled their interest.

Copyright 2016 NPR. To see more, visit NPR.