Protests broke out Sunday across the country following President Trump's sweeping executive order barring refugees and people from seven majority-Muslim countries from entering the country for set periods of time.

Lawmakers on Sunday joined thousands of people who gathered in several states to protest the president's order.

Thousands of people gathered Sunday in Boston's Copley Square to protest the immigration ban, according to USA Today.

Protesters were joined by Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.), along with other Massachusetts lawmakers such as Boston Mayor Marty Walsh and Sen. Ed Markey Edward (Ed) John MarkeyMassachusetts town clerk resigns after delays to primary vote count Bogeymen of the far left deserve a place in any Biden administration Senate Democrats urge Amazon to recall, stop sales of explosive products MORE (D).

Crowd of demonstrators gathering in Boston's Copley Square pic.twitter.com/9Yjew0QPQU — Evan McMurry (@evanmcmurry) January 29, 2017

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People also came out in New York City on Sunday afternoon to protest in Battery Park. Senate Majority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) tweeted that he was heading to there to "protest these awful actions."

Sen. Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE (D-N.Y.) also said she would stand with the thousands of "concerned New Yorkers to protect Trump's shameful executive order."

Today at 2pm in Battery Park, I'll stand with thousands of concerned New Yorkers to protest Trump's shameful executive order. — Kirsten Gillibrand (@SenGillibrand) January 29, 2017

In Washington, D.C., lawmakers joined protesters at the White House to stand up against the order, with newly elected Sens. Kamala Harris (D-Calif.) and Catherine Cortez Masto (D-Nev.) spotted in the crowd.

Thousands turning out to protest at the White House. Proud! pic via @bmcushing pic.twitter.com/YJl6QgvzlK — Adam Parkhomenko (@AdamParkhomenko) January 29, 2017

Together we can fight for and win back our democracy. Join us at the White House at 1pm to protest the #MuslimBan. Let’s raise our voices. — Kamala Harris (@KamalaHarris) January 29, 2017

Protests are also scheduled throughout the day in Philadelphia, Atlanta, Los Angeles, Seattle and Chicago, according to CNN.

The president on Friday signed an executive order that bars Syrian refugees indefinitely and halts the country's refugee resettlement program for four months.

It also denies entry for 90 days to people from seven majority-Muslim countries: Iran, Iraq, Syria, Yemen, Somalia, Sudan and Libya.

Protests broke out Saturday at airports across the country against the immigration ban, with people urging the country to be welcoming to immigrants and refugees, and lawyers flocking to offer aid to detained people.