Trump's official announcement is expected Friday in NY at the Hilton hotel in midtown Manhattan. The New York Times reported that Trump has "signaled strongly to Republicans in Washington that he will pick Mike Pence".
Pence emerges as the probable candidate from a short list of prominent Republicans including former House Speaker Newt Gingrich and New Jersey Governor Chris Christie.
"I suspect some time tomorrow that Mike and I will both get phone calls, and one of us will be packing our bags to go to NY, and the other one will be going to watch it on TV", Gingrich said Wednesday.
Following the meeting, Pence's deputy campaign manager was seen leaving Indianapolis for NY for "some meetings" on Thursday morning.
Pence ran unsuccessfully for Congress twice before he won election to the House of Representatives in 2000, where he was chairman of the Republican Study Committee, a group of conservatives. Then, Trump, his children and a top adviser met with Pence at his IN mansion for about an hour on Wednesday morning.
Pence remains a staunch social conservative and is a devout evangelical Christian.
Pence, 57, an evangelist who has served in the statehouse since 2013, has been long floated as a finalist in Trump's so-called veepstakes. He has also signed similarly restrictive measures on women's reproductive health. The 73-year-old would be the oldest candidate ever to become vice president.
Pence has also criticized Trump's rhetoric about a judge of Mexican heritage in a lawsuit associated with Trump University.
Pence's team has gotten word to start preparing to get the official nod Thursday, and the Trump campaign is now planning for the official nod Thursday, according to two sources familiar with the process. He's also become a valuable partner for Trump, joining him at events on the trail and taking on the important role of heading Trump's transition planning.