SAN ANTONIO -- With a new president comes elation, tears and confusion. Many people are unclear how President-elect Donald Trump's promises will play out in office.

"He's going to face obstacles he hasn't faced as head of a corporation," said Trinity University Political Science Professor John Hermann, who's heard the promises and fear.

He sat down with KENS 5 to talk about what it takes to change laws and the challenges the President-Elect could face.

On the campaign trail Donald Trump said:

"I am going to create a new special deportation task force focused on identifying and quickly removing the most dangerous criminal illegal immigrants in America.”

Hermann said that sweeping immigration changes are easier said than done.

"There are 535 members in Congress," said Hermann, who added that there needs to be a majority support for legislation to move forward, and by the time all parties agree on a law, it will likely be diluted.

On the campaign trail Trump also said he wants to build a "great wall along the southern border," and have Mexico foot the bill.

However there is no precedent for the president to demand another country pay for a U.S. plan, leaving the question about executive action.

"It would have to derive directly from the United States Constitution, powers in Article Two, or from a congressional law. Neither one is very clear about building a new wall and changing immigration policy so drastically," Hermann said.

With the votes in, Congress is now mostly in. Trump will be working with moderate Republicans, Tea Party members and Democrats. The next mid-term elections could change the make-up of Congress.

"Usually the president's party loses seats. There’s only been two times in the 20th century where the president's party didn't lose seats in a mid-term election," Hermann said.

During his acceptance speech, Trump said he wanted unity both politically and across the nation.

"For those who have chosen not to support me in the past, of which there were a few people, I'm reaching out to you for your guidance and your help so that we can work together and unify our great country," Trump said.

As for gun policies, in May when the NRA endorsed Trump, he said that he wants to repeal gun-free zones. That would likely mean repealing the Gun Free School Zone Act and could mean legal resistance based on the Constitution.