Hillary Clinton has spoken out in support of protesters demonstrating against President Trump's executive order temporarily banning refugees and immigrants from predominantly Muslim countries.

She wrote in a message posted to Twitter late Saturday, "I stand with the people gathered across the country tonight defending our values & our Constitution. This is not who we are."

18 PHOTOS Stars react to Donald Trump's immigration ban See Gallery Stars react to Donald Trump's immigration ban My best friend, Alaa Mohammad Khaled, is Muslim. His parents were Palestinian refugees. His brother is DJ Khaled.… https://t.co/ikB8eTqkrA Will anyone stand up for them? Any politicians? https://t.co/8buaPXgyHV Along with liar,racist,misogynist,fool,infantile,sick,narcissist-with the Muslim ban we can now add heartless & evil to DT's repertoire. To our Muslim neighbors in the world: I & tens of millions of others are so very sorry. The majority of Americans did not vote 4 this man. ! https://t.co/Nj6QE4GL5N I hope we're all paying attention. https://t.co/vcpcdquogB Hey @mike_pence @SenJohnMcCain @SpeakerRyan, you should be ashamed of yourselves. On your deathbeds you will know you made the world worse. Asghar Farhadi, 2 time Oscar nominee, BAFTA nominee, Golden Bear winner, Palme D'or & César award nominee. BANNED from entering US. 🇮🇷 Let me add Oscar WINNER, Golden Globe winner, César winner & listed on Foreign Policy's Top 100 Global Thinkers, Asghar Farhadi. 🇮🇷 Amplifying words of one of my favorite filmmakers, Asghar Farhadi, who like too many others will be turned away fro… https://t.co/3X4mOlHUrV My heart is breaking today for the Muslim community around the world 😞💔 Look, whatever your politics, the #MuslimBan hurts real families & will do little to stop terrorism. My wife's Dad is an Iranian immigrant. .@realDonaldTrump FYI this endangers our armed forces in the future. Who would want to help us, when this is how we… https://t.co/Sr4SPpuwb8 I'm sorry @SpeakerRyan but given your absolute silence on the #MuslimBan this tweet, like your smile, is phony and… https://t.co/Kik15RJMqi The Deplorable States of America. #muslimban THANKU to the protesters @ JFK vocalising their repulsion at the action to ban Muslim refugees & immigrants & green card holders into the US Donald Trump is an unwell, evil human being. To the core. ❤💛💙💚 https://t.co/LhYmxPLdNE Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

Trump defended his controversial move to the public, tweeting on Sunday, "Our country needs strong borders and extreme vetting, NOW. Look what is happening all over Europe and, indeed, the world – a horrible mess!"

SEE MORE: Follow along to find out what campaign promises Trump has kept

According to NPR, thousands of people protested his action at airports across the country; some had notable attendees such as city mayor Marty Walsh and Senator Elizabeth Warren at Boston's Logan International airport.

Lawyers battling against the temporary ban achieved a victory Saturday night when a U.S. District judge granted an emergency stay, but only impacted citizens who had already arrived in the U.S. or those with valid visa who were in transit.

The DHS had at one point reported that 109 visitors at U.S. airports and 173 foreigners headed to the U.S. were kept from officially setting foot onto American soil because of the sudden ban issued on Friday.

SEE MORE: Ivanka Trump's photo sparks outrage amid humanitarian chaos

The ban impacts residents from predominantly Muslim countries of Iraq, Syria, Iran, Sudan, Libya, Somalia and Yemen for three months and blocks Syrian refugees indefinitely.