Legal experts discuss what Donald Trump can and can't do as president

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SALT LAKE CITY (FOX 13) -- While protesters expressed outrage in the streets over Donald Trump's presidency, many have voiced concerns on social media--wondering how Trump's presidency will influence immigration, health care and same-sex marriage.

Trump has an action plan for his first 100 days in office, which ranges from deporting illegal immigrants, to suspending immigration from some areas, to building a wall along the U.S. Mexico border, to repealing Obamacare.

But can Trump really do what he promised?

We'll start with immigration.

SEE MORE: The Democratic Party descends into 'civil war' after Clinton's loss

Trump said he'll deport more than 2 million "criminal illegal immigrants."

James Curry, Assistant Professor of Political Science at the University of Utah, indicated the worries surrounding that policy are warranted, depending on who you are.

"For anyone who is in the country illegally, it's a legitimate fear," he said.

As president, Trump would carry power to come down harshly on immigration, Curry explained. But it will only go so far.

"There are laws," Curry said. "[The president] can't just uproot whoever [he] wants."

Trump also wants to suspend immigration from terror-prone regions.

"Ban on people from coming in? He could try," Curry said.

But, in order to structure immigration in certain ways, he said, it would require an act of Congress.

Related: Trump meets with Obama at White House

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President Obama meets with Trump
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President Obama meets with Trump
U.S. President Barack Obama meets with President-elect Donald Trump (L) in the Oval Office of the White House in Washington November 10, 2016.REUTERS/Kevin Lamarque
U.S. President Barack Obama (R) meets with President-elect Donald Trump to discuss transition plans in the White House Oval Office in Washington, U.S., November 10, 2016. REUTERS/Kevin Lamarque
U.S. President Barack Obama meets with President-elect Donald Trump (L) in the Oval Office of the White House in Washington November 10, 2016.REUTERS/Kevin Lamarque
U.S. President Barack Obama (R) meets with President-elect Donald Trump to discuss transition plans in the White House Oval Office in Washington, U.S., November 10, 2016. REUTERS/Kevin Lamarque
U.S. President Barack Obama meets with President-elect Donald Trump (L) in the Oval Office of the White House in Washington November 10, 2016.REUTERS/Kevin Lamarque
U.S. President Barack Obama meets with President-elect Donald Trump to discuss transition plans in the White House Oval Office in Washington, U.S., November 10, 2016. REUTERS/Kevin Lamarque
U.S. President Barack Obama (R) greets President-elect Donald Trump in the White House Oval Office in Washington, U.S., November 10, 2016. REUTERS/Kevin Lamarque
U.S. President Barack Obama meets with President-elect Donald Trump (L) to discuss transition plans in the White House Oval Office in Washington, U.S., November 10, 2016. REUTERS/Kevin Lamarque
Obama and Trump discussed a range of domestic and foreign policy topics at the White House during their first meeting since Trump's stunning election victory.
U.S. President Barack Obama shakes hands with President-elect Donald Trump (L) to discuss transition plans in the White House Oval Office in Washington, U.S., November 10, 2016. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY
U.S. President Barack Obama (R) greets President-elect Donald Trump in the White House Oval Office in Washington, U.S., November 10, 2016. REUTERS/Kevin Lamarque
U.S. President Barack Obama shakes hands with President-elect Donald Trump (L) to discuss transition plans in the White House Oval Office in Washington, U.S., November 10, 2016. REUTERS/Kevin Lamarque
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That means lawmakers, Democrats included, would need to jump on board.

Same with that proposed wall to separate the border between the U.S. and Mexico.

That's because, Curry said, it'd be costly and not likely Mexico would fund it.

As Senator Orrin Hatch, R-Utah, explained on election night, he holds the purse strings for anything Trumps wants to fund.

"As Chairman of the Finance Committee, he's going to have to have me," Hatch explained, referencing Trump's need to have his support. "Because that's the committee where all the money is."

Curry said the Trump Administration could just end up beefing up border security, or building portions of the wall.

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Some worry about Trump's pick for the Supreme Court, to replace former Justice Antonin Scalia.

Paul Cassell, Professor of Law at the University of Utah College of Law, said Trump has indicated he intends to fill the spot with someone similar to Scalia, meaning his pick probably won't change much as far as the balance of the court.

"I don't think the Supreme Court is going to create any real significant day-to-day change in people's lives, compared to what they're doing now," he said.

That means decisions like same-sex marriage will likely stay where they're at.

How about fully repealing Obamacare?

Trump says he'll do it, but Curry said it's more likely the Trump Administration will end up pushing some sort of reform bill that repeals aspects of Obamacare, rather than the whole thing.

Curry explained that, in the end, the government's system of checks and balances makes it hard for any president to come in and do what they want, Trump included.

See photos from Trump's victory party:

25 PHOTOS
Donald Trump becomes president-elect of the United States
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Donald Trump becomes president-elect of the United States

U.S. President-elect Donald Trump speaks at his election night rally in Manhattan, New York, U.S., November 9, 2016.

(REUTERS/Carlo Allegri)

Donald Trump supporters cheer as U.S. presidential election results are announced during a Republican watch party in Phoenix, Arizona, November 8, 2016.

(REUTERS/Nancy Wiechec)

Republican president-elect Donald Trump delivers his acceptance speech during his election night event at the New York Hilton Midtown in the early morning hours of November 9, 2016 in New York City. Donald Trump defeated Democratic presidential nominee Hillary Clinton to become the 45th president of the United States.

(Photo by Chip Somodevilla/Getty Images)

Republican presidential elect Donald Trump (L) arrives to speak during election night at the New York Hilton Midtown in New York on November 9, 2016. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

President-elect Donald Trump, shakes hands with Vice-President-elect Mike Pence during his election night rally, Wednesday, Nov. 9, 2016, in New York.

(AP Photo/John Locher)

U.S. President-elect Donald Trump and his campaign manager Kellyanne Conway greet supporters during his election night rally in Manhattan, New York, U.S., November 9, 2016.

(REUTERS/Mike Segar/TPX IMAGES OF THE DAY)

Supporters of Republican presidential candidate Donald Trump cheer as they watch election returns during an election night rally, Tuesday, Nov. 8, 2016, in New York.

(AP Photo/ Evan Vucci)

Eric Trump and Donald Trump Jr. look on as Republican presidential elect Donald Trump speaks during election night at the New York Hilton Midtown in New York on November 9, 2016.

(JIM WATSON/AFP/Getty Images)

US President-elect Donald Trump arrives at the New York Hilton Midtown in New York on November 8, 2016. Trump stunned America and the world Wednesday, riding a wave of populist resentment to defeat Hillary Clinton in the race to become the 45th president of the United States.

(SAUL LOEB/AFP/Getty Images)

Republican U.S. presidential nominee Donald Trump greets supporters at his election night rally in Manhattan, New York, U.S., November 9, 2016.

(REUTERS/Carlo Allegri)

Vice president-elect Mike Pence speaks to supporters at Republican president-elect Donald Trump's election night event at the New York Hilton Midtown in the early morning hours of November 9, 2016 in New York City. Donald Trump defeated Democratic presidential nominee Hillary Clinton to become the 45th president of the United States.

(Photo by Joe Raedle/Getty Images)

Republican president-elect Donald Trump walks on stage with his son Barron Trump, wife Melania Trump and Ivanka Trump during his election night event at the New York Hilton Midtown in the early morning hours of November 9, 2016 in New York City. Donald Trump defeated Democratic presidential nominee Hillary Clinton to become the 45th president of the United States.

(Photo by Chip Somodevilla/Getty Images)

A supporter celebrates as returns come in for Republican U.S. presidential nominee Donald Trump during an election night rally in Manhattan, New York, U.S., November 8, 2016.

(REUTERS/Mike Segar)

Chairman of the Republican National Committee (RNC) Reince Priebus hugs Republican presidential elect Donald Trump during election night at the New York Hilton Midtown in New York on November 9, 2016.

(JIM WATSON/AFP/Getty Images)

Former New York City Mayor Rudolph Giuliani arrives on stage with his wife Judith Nathan as U.S. President-elect Donald Trump addressed supporters at his election night rally in Manhattan, New York, U.S., November 9, 2016.

(REUTERS/Brendan McDermid)

US President-elect Donald Trump greets son Eric after speaking at the New York Hilton Midtown in New York on November 8, 2016. Trump stunned America and the world Wednesday, riding a wave of populist resentment to defeat Hillary Clinton in the race to become the 45th president of the United States.

(SAUL LOEB/AFP/Getty Images)

Vice president-elect Mike Pence walks on stage with his wife Karen Pence at Republican president-elect Donald Trump election night event at the New York Hilton Midtown in the early morning hours of November 9, 2016 in New York City. Americans went to the polls yesterday to choose between Republican presidential nominee Donald Trump and Democratic presidential nominee Hillary Clinton as they go to the polls to vote for the next president of the United States.

(Photo by Joe Raedle/Getty Images)

US President-elect Donald Trump arrives with his son Baron and wife Melania at the New York Hilton Midtown in New York on November 8, 2016. Trump stunned America and the world Wednesday, riding a wave of populist resentment to defeat Hillary Clinton in the race to become the 45th president of the United States.

(SAUL LOEB/AFP/Getty Images)

U.S. President-elect Donald Trump, speaks an election night party at the Hilton Midtown hotel in New York, U.S., on Wednesday, Nov. 9, 2016. Trump was elected the 45th president of the United States in a repudiation of the political establishment that jolted financial markets and likely will reorder the nation's priorities and fundamentally alter America's relationship with the world.

(Photographer: Andrew Harrer/Bloomberg via Getty Images)

Melania Trump and Ivanka Trump look on as Republican presidential elect Donald Trump speaks during election night at the New York Hilton Midtown in New York on November 9, 2016.

(JIM WATSON/AFP/Getty Images)

U.S. President-elect Donald Trump arrives to speak during an election night party at the Hilton Midtown hotel in New York, U.S., on Wednesday, Nov. 9, 2016. Trump racked up victory after victory in key states Tuesday to put himself in position to threaten Hillary Clinton for the White House, with the results in three Rust-Belt states likely to determine the next U.S. president.

(Photographer: Andrew Harrer/Bloomberg via Getty Images)

Republican president-elect Donald Trump delivers his acceptance speech during his election night event at the New York Hilton Midtown in the early morning hours of November 9, 2016 in New York City. Donald Trump defeated Democratic presidential nominee Hillary Clinton to become the 45th president of the United States.

(Photo by Chip Somodevilla/Getty Images)

President-elect Donald Trump gives his acceptance speech during his election night rally, Wednesday, Nov. 9, 2016, in New York.

(AP Photo/John Locher)

Attendees cheer during an election night party for U.S. President-elect Donald Trump at the Hilton Midtown hotel in New York, U.S., on Wednesday, Nov. 9, 2016. Trump was elected the 45th president of the United States in a repudiation of the political establishment that jolted financial markets and likely will reorder the nation's priorities and fundamentally alter America's relationship with the world.

(Photographer: Andrew Harrer/Bloomberg via Getty Images)

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