WATCH LIVE: Appeals court hears oral arguments on Trump's travel ban

President Donald Trump's travel ban faces another major legal hurdle Tuesday afternoon as lawyers present oral arguments to the Court of Appeals for the Ninth Circuit in San Francisco.

The arguments will take place over the phone so the livestream will be just audio.

Trump's executive order barring immigrants and refugees from select Middle Eastern countries from entering the U.S. has been temporarily blocked by a judge since a ruling issued on Friday.

Trump has argued that the ban is a key part of his national security plan, and said at an event with sheriffs at the White House, "I actually can't believe that we're having to fight to protect the security, in a court system, to protect the security of our nation."

The executive order, issued on January 27, barred entry for citizens from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen for 90 days and imposed a 120-day halt on all refugees.

But a federal judge in Seattle, responding to a challenge by Washington state, suspended the order last Friday.

Learn more about the ban and what Trump just said about it

23 PHOTOS
Protesters and lawyers welcome international travelers in airports amid immigration ban
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Protesters and lawyers welcome international travelers in airports amid immigration ban
A young girl dances with an American flag in baggage claim while women pray behind her during a protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport in Dallas, Texas, U.S. January 29, 2017. REUTERS/Laura Buckman
People chant and hold signs as they protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport International Arrivals gate in Dallas, Texas, U.S. January 29, 2017. REUTERS/Laura Buckman
An international traveler smiles as she walks past the protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport in Dallas, Texas, U.S. January 29, 2017. REUTERS/Laura Buckman
Lawyers and legal assistants network and use social media in the baggage claim area, amid supplies of pizza, water and other food, at Dulles International Airport, aiding passengers who have arrived and encounter problems because of Donald Trump's travel ban to the United States, in Chantilly, Virginia, in suburban Washington, U.S., January 29, 2017. REUTERS/Mike Theiler
Volunteer lawyers work in a dining area of Terminal 4 to assist travelers detained as part of Donald Trump's travel ban in Terminal 4 at John F. Kennedy International Airport in Queens, New York, U.S., January 29, 2017. REUTERS/Andrew Kelly
Lawyer Darryl Hairston works with a team of volunteer lawyers to arrange habeus corpus petitions for travelers detained as part of Donald Trump's travel ban in Terminal 4 at John F. Kennedy International Airport in Queens, New York, U.S., January 29, 2017. REUTERS/Andrew Kelly
Demonstrators yell slogans during anti-Donald Trump travel ban protests outside Hatfield-Jackson Atlanta International Airport in Atlanta, Georgia U.S., January 29, 2017. REUTERS/Chris Aluka Berry
Demonstrators sit inside LAX international terminal and yell slogans during protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Los Angeles International Airport in Los Angeles, California, U.S., January 29, 2017. REUTERS/Ted Soqui
Demonstrators yell slogans during anti-Donald Trump travel ban protests outside Philadelphia International Airport in Philadelphia, Pennsylvania, U.S., January 29, 2017. REUTERS/Charles Mostoller
Women walk by a team of volunteer lawyers in their makeshift office working to assist travelers detained as part of Donald Trump's travel ban in Terminal 4 at John F. Kennedy International Airport in Queens, New York, U.S., January 29, 2017. REUTERS/Andrew Kelly
Demonstrators march and block traffic during anti-Donald Trump travel ban protests outside Philadelphia International Airport in Philadelphia, Pennsylvania, U.S., January 29, 2017. REUTERS/Charles Mostoller
An international traveler smiles as she walks past the protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport in Dallas, Texas, U.S. January 29, 2017. REUTERS/Laura Buckman
LOS ANGELES, CA - JANUARY 29: Protesters hold signs during a demonstration against the immigration ban that was imposed by U.S. President Donald Trump at Los Angeles International Airport on January 29, 2017 in Los Angeles, California. Thousands of protesters gathered outside of the Tom Bradley International Terminal at Los Angeles International Airport to denounce the travel ban imposed by President Trump. Protests are taking place at airports across the country. (Photo by Justin Sullivan/Getty Images)
Demonstrators hold signs outside Los Angeles International Airport (LAX) protesting against U.S. President Donald Trump's executive order blocking visitors from seven predominantly Muslim nations in Los Angeles, California, U.S., on Sunday, Jan. 29, 2017. Court decisions temporarily blocked the U.S. administration from enforcing parts of Trump's order after a day in which students, refugees and dual citizens were stuck overseas or detained and some businesses warned employees from those countries not to risk leaving the United States. Photographer: Dania Maxwell/Bloomberg via Getty Images
LOS ANGELES, CA - JANUARY 29: Protesters march during a demonstration against the immigration ban that was imposed by U.S. President Donald Trump at Los Angeles International Airport on January 29, 2017 in Los Angeles, California. Thousands of protesters gathered outside of the Tom Bradley International Terminal at Los Angeles International Airport to denounce the travel ban imposed by President Trump. Protests are taking place at airports across the country. (Photo by Justin Sullivan/Getty Images)
LOS ANGELES, UNITED STATES - JANUARY 29: Demonstrators against President Donald Trump's Muslim Ban come together at 2nd Day of protests at Los Angeles International Airport, in Los Angeles, California, United States on January 29, 2017. Lots of muslim people still under custody of US Custom and Border Patrol after Trumps's executive order. (Photo by Aydin Palabiyikoglu/Anadolu Agency/Getty Images)
Protesters gather at the international arrivals area of the Washington Dulles International Airport on January 29, 2017, in Sterling, Virginia. US President Donald Trump issued an executive order yesterday barring citizens of seven Muslim-majority countries from entering the United States for the next 90 days and suspends the admission of all refugees for 120 days. / AFP / Thomas WATKINS (Photo credit should read THOMAS WATKINS/AFP/Getty Images)
Protestors crowd the sidewalks at HartsfieldJackson Atlanta International Airport to denounce US President Donald Trump's executive order, which restricts refugees and travelers from seven Muslim-majority countries in Atlanta, Georgia on January 29, 2017 / AFP / TAMI CHAPPELL (Photo credit should read TAMI CHAPPELL/AFP/Getty Images)
More than 600 people holding protests signs gathered on Sunday, Jan. 29, 2017 at the Boise Airport to voice opposition to President Donald Trump's recent refugee order. The protest started with a FaceBook page asking people in the area to join a nationwide movement to gather at airports. (Darin Oswald/Idaho Statesman/TNS via Getty Images)
PHILADELPHIA, PA - JANUARY 29: Demonstrators at Philadelphia International Airport protest against the executive order that President Donald Trump signed clamping down on refugee admissions and temporarily restricting travelers from seven predominantly Muslim countries on January 29, 2017 in Philadelphia, Pennsylvania. Demonstrators gathered at airports across the country in protest of the order. (Photo by Jessica Kourkounis/Getty Images)
PHILADELPHIA, PA - JANUARY 29: A police officer stands guard as demonstrators at Philadelphia International Airport protest against the executive order that President Donald Trump signed clamping down on refugee admissions and temporarily restricting travelers from seven predominantly Muslim countries on January 29, 2017 in Philadelphia, Pennsylvania. Demonstrators gathered at airports across the country in protest of the order. (Photo by Jessica Kourkounis/Getty Images)
Thousands turn out for a January 29th, 2017 Immigration Ban Protest at Philadelphia International Airport, in Philadelphia Pennsylvania. (Photo by Bastiaan Slabbers/NurPhoto via Getty Images)
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