Donald Trump's expected running mate Mike Pence has expressed fundamental disagreement with two of Donald Trump's main campaign planks.

Pence is a social and economic conservative who held a key post that allowed to negotiate with party leaders in Washington.

He also shares two views held by the bulk of the establishment in D.C.: a belief that Trump's proposed temporary ban on Muslims is harmful and unrealistic, and a belief in the shared benefits of liberalization of trade with foreign partners.

Last December, after Trump announced his Muslim ban following the gruesome attack in Paris, Pence tweeted: 'Calls to ban Muslims from entering the U.S. are offensive and unconstitutional.'

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Indiana governor Mike Pence, expected to be named as Donald Trump's running mate, has blasted Trump's proposed Muslim ban, while voting for a series of deals to lower trade barriers

Pence blasted Trump's proposed Muslim ban as 'unconstitutional'

He also backed a series of trade deals during his 6 terms in Congress that were a major part of the economic agendas of President's George W. Bush and Barack Obama.

Among them is a current hot button issue, the Trans Pacific Partnership. It's a deal to liberalize trade with multiple partners in the Pacific region that President Obama is pushing for.

Campaigning in Pennsylvania last month, Trump blasted the TPP deal as 'just a continuing rape of our country.'

Democrat Hillary Clinton, who spoke favorably of the deal while it was being negotiated, has said she opposes it as it stands now.

Pence also opposed NAFTA, finalized during Bill Clinton's administration. Trump has said he wants to repeal the deal.

He has also backed smaller regional and bilateral trade deals, including the Central American Free Trade deal, known as CAFTA.

Trump and Pence have starkly different views on trade deals

He supported a free trade deal with Korea, another with Peru, a deal with Singapore, and bilateral deals with Chile, Australia, and Panama.

He's a supporter of 'fast track' trade negotiating authority, which makes it easier for the president to negotiate trade deals and get them through Congress, and he voted to join the World Trade Organization, which mediates trade disputes.

Even after moving into the governor's mansion in Indianapolis, Pence backed trade liberalization, urging Indiana lawmakers to vote for TPP.

'Reducing tariffs and other trade barriers so that Indiana businesses can enjoy increased market access and fairly compete on the world stage is something that Congress must do,' Pence wrote. 'I encourage your support for Trade Promotion Authority, the Trans-Pacific Partnership, the Trans-Atlantic Trade and Investment Partnership and any other trade-related measures when they are brought before the Congress for consideration.'

Pence tweeted in 2014: 'Trade means jobs, but trade also means security. The time has come for all of us to urge the swift adoption of the Trans Pacific Partnership'

Pence called for 'swift adoption' of the Trans Pacific Partnership trade deal

Another issue where Pence is at odds with Trump's public position is the Iraq war. Pence voted for the Iraq war resolution in 2003. Trump holds out his opposition to it as proof of his own judgement, and of Hillary Clinton's lack thereof (she voted for it, too).

Trump has said he would do extraordinary things to prevent job losses exemplified by the Carrier plant in Indiana that is moving to Mexico. He says he would threaten the CEO with huge tariffs.

Pence met with Carrier executives but was unable to keep the country from leaving, and Democrats have already been hitting him with the issue in what was expected to be a tough reelection.

One thing Pence has done is praised Trump with absolute certainty – that is other than his endorsement of rival Ted Cruz a few months ago.

'Trump understands the frustrations and the hopes of the American people like no other American leader in my lifetime since Ronald Reagan' Pence said during his 'audition' with Trump in Indiana.

Former House Speaker Newt Gingrich, also under consideration to be Trump's VP, hailed Pence during a Facebook live chat Thursday as someone who can help Trump in the rust belt.

'I think that Mike Pence would have a huge Midwestern appeal, so if you're trying to compete for western Pennsylvania, Ohio, Michigan, Wisconsin, Missouri, Illinois, there's a certain value to an Indiana candidate,' said Gingrich.