UPDATE: Jan. 29 at 9:07 p.m.
Protesters outside of Philadelphia International Airport sang Woody Guthrie's "This Land Is Your Land" to show support for passengers who've been detained because of Trump's executive order.
UPDATE: Jan. 29 at 3:29 p.m. -- Here's look at the protest next to the White House.
Thousands are expected to gather in front of the White House Sunday to protest President Donald Trump's executive order barring immigrants from seven majority-Muslim countries, according to a Facebook event page.
The event, called the "No Muslim Ban," is scheduled to take place at 1 p.m. but protestors began lining up long before then. "Join us at the White House and say NO to Trump's new policies that will ban refugees, immigrants, and visa holders from Iran, Iraq, Syria, Libya, Sudan, Somalia and Yemen," the event page says.
Sen. Kamala Harris (D-Calif.) tweeted calling for people to join the protest.
Here's a live look at the protest outside of the White House.
Protests are expected to pop up across the nation Sunday, as immigration advocates continue to pressure the Trump administration to end the ban.
Saturday, protesters converged on major airports across the nation to advocate for immigration reform and in New York, taxi drivers responded with a strike. The New York Taxi Workers Alliance announced that they would not be picking up from John F. Kennedy International Airport Saturday from 6-7 p.m. to protest the immigration ban.
An immigration ban protest is underway outside of Raleigh-Durham Airport in N.C.
Here's a look at the protest at John Glenn International Airport in Ohio.
Rochester, N.Y. held a protest as well.
What does the executive order do?
Trump's executive order, which was signed Friday, prevents any refugees from entering the United States for 120 days. The order also bans those traveling from Iraq, Syria, Iran, Sudan, Libya, Somalia and Yemen for 90 days.
The Department of Homeland Security issued a statement Sunday, saying the department won't have much of an impact on the "overall implementation" of Trump's executive order.
"President Trump’s Executive Orders remain in place prohibited travel will remain prohibited, and the U.S. government retains its right to revoke visas at any time if required for national security or public safety," DHS said in a statement.
In addition, the statement noted that "less than one percent of the more than 325,000 international air travelers who arrive every day were inconvenienced" by the new security measures.