The Wall Street Journal: Donald Trump to announce his running mate Friday

Newt Gingrich on Wednesday said Donald TrumpDonald TrumpGingrich: Trump down to me, Pence for vice president Trump counsel: Aide sued for M wants "free publicity" Hannity defends private jet flight for Gingrich as friendly favor MORE's field of possible running mates is down to two people.

Gingrich, a former Georgia congressman, became Speaker of the House in 1995 after leading a Republican wave that captured the chamber from the Democrats in the midterm elections during the administration of Bill Clinton.

Most presumptive nominees operate their vice presidential search quest under intense secrecy with potential candidates sneaking to cloak-and-dagger meetings to avoid the press and maintain the element of surprise ahead of the final announcement.

Chris Christie, and former House Speaker Newt Gingrich have been mentioned as finalists.

After traveling together on Tuesday, Pence and Trump met up again on Wednesday at the governor's mansion.

Trump and Pence met privately before a fundraiser in Indianapolis on Tuesday evening, and then Pence got a try-out at a rally in nearby Westfield.

If Pence steps away from the race to join Trump's ticket, by IN law he'd have to pull his name from the governor's race, triggering a process that would compel the 24-member Republican Party state committee to choose his replacement.

"I'm narrowing it down", Trump told Fox News.

Trump has likely discovered, in a deep vetting of Pence, that the man who steadfastly championed a socially and fiscally conservative agenda in Congress and the Statehouse wasn't always so.

"He's a builder, and he's a fighter and he's a patriot and I think he's going to make a great President of the United States", Pence said after a tour of food alley.

Republican presidential candidate Donald Trump gives a thumbs-up as he leaves the residence of Indiana Gov. Mike Pence in Indianapolis, Wednesday, July 13, 2016.

"Nothing was offered. Nothing was accepted", Pence said.

Throughout much of the talk, Gingrich praised Trump's prowess as a politician and negotiator, noting his success on TV, in real estate development and other ventures.

"I just want to pick up somebody that's solid, who's smart". Mr Gingrich said of himself and Mr Trump.

Sources previously told NBC News Trump would announce his choice for vice presidential candidate Friday.

In the speech, Gingrich said Trump "has found a formula which is worthy of study".

"I think Gingrich is the safest bet", said the attendee, who spoke on the condition of anonymity, noting that Gingrich can play the role as chief critic of Hillary Clinton as well as help Trump navigate Washington. Jeff Sessions and New Jersey Gov. Chris Christie.

Trump is said to have narrowed his short list down to a trio of top contenders, including Pence. "You find out sooner or later who the last one standing is".

Pence, once House Republican leader, is well thought of among both Republicans and conservatives. Their governing experience and popularity among the party's conservative base would mark a sharp contrast to Trump, whose brand of politics has alienated hard-line conservatives and establishment Republicans alike. "I have to say that he is winning me over - slowly I am coming along".

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