As Donald Trump signals he may have picked his running mate, you're likely wondering: who is Mike Pence? Indiana's governor since 2013, the conservative Republican is a former congressman.

And while he would add political experience to the ticket, he'd also be fielding questions about how he and Trump don't see eye-to-eye on some major issues. Josh Robin explains.

On a frozen Monday in 2013, Mike Pence took office as Indiana's 50th governor, beginning by praising God.

It was an unsurprising start. Pence's calls himself "a Christian, a conservative, and a Republican — in that order."

The titles aren't always linked to Donald Trump, who arguably Trump may be tapping Pence as a link.

But both may have to explain why Mike Pence and Donald Trump so often part, starting with one key issue:

"Donald J. Trump is calling for a total and complete shutdown of Muslims entering the United States," Trump said, reading a statement to supporters Dec. 7.

Asked about the disconnect, Pence apparently didn't fully answer:

"I've taken issue with our candidates from time to time, but I'm supporting Donald Trump," the Indiana governor said.

Pence also takes different sides on another Trump pet issue: trade.

As Hillary Clinton stumped in Virginia, Trump tweeted:


But the North American Free Trade Agreement (NAFTA) is something Pence long champions.

"As the nation's sixth-largest corn producer, Indiana benefited directly under the North American Free Trade Agreement," Pence said in 2001 while in Congress.

And not just NAFTA; a Congressional review shows widespread support for trade deals, which Trump says have been poorly negotiated.

Likening it to rape, Trump also railed against the proposed Trans-Pacific Partnership (TPP) on June 22, saying it will ship "millions more of our jobs overseas and give up Congressional power."

"The time has come for all of us, on both sides of the Pacific, to urge the swift adoption of the Trans Pacific Partnership," Pence said in September.

Pence is also drawing attention for writing 15 years ago that smoking "doesn't kill," and adding, "global warming is a myth."

More recently, Pence signed a bill overruling local laws that had barred sexual orientation-based discrimination.

Amid a national uproar, he amended the bill, angering social conservatives.