One day after Americans came out in cities across the U.S. to protest an executive order signed by President Donald Trump on Friday banning Syrian refugees and travelers from seven Muslim-majority countries from entering the country, tens of thousands of Brits rallied in solidarity.

Demonstrators took to the streets of cities including London, Manchester, Glasgow, Cardiff and Edinburgh on Monday evening to express their opposition to the Trump administration’s action.

But protesters also voiced frustration with British Prime Minister Theresa May. Crowds gathered just steps away from the gates of the prime minister’s residence in Downing street on Monday chanting “Shame on May,” The Guardian reported.

May, who visited the U.S. last week, has faced criticism from lawmakers and the public for not speaking out forcefully against Trump’s travel ban. Over the weekend, the hashtag #TheresaTheAppeaser trended on Twitter. Meanwhile, more than 1.5 million people have signed a petition calling for the U.K. not to invite Trump on an official State Visit. The petition argued that it “would cause embarrassment to Her Majesty the Queen.”

Check out photos of the protests below:

Dylan Martinez / Reuters Tens of thousands of protesters gathered in London on Monday to protest the Trump administration's decision to ban the entry of Syrian refugees and travelers from seven Muslim-majority countries to the U.S.

Dylan Martinez / Reuters Demonstrators in the British capital held placards reading, "Love, not walls," and "No to racism, No to Trump."

Dylan Martinez / Reuters Many had gathered outside the residence of British Prime Minister Theresa May, who's been criticized for not condemning the travel ban forcefully.

Dylan Martinez / Reuters Over the weekend, the hashtag #TheresaTheAppeaser trended on Twitter.

Dylan Martinez / Reuters More than 1.5 million people signed a petition in recent days demanding that President Trump would not be invited for an official State Visit to the U.K.

Dylan Martinez / Reuters Demonstrators in the capital expressed their solidarity with Syrian refugees and travelers the seven countries barred from entering the U.S., holding signs that read "Jews stand with Muslims."

Mark Runnacles via Getty Images Protesters also gathered near the Scottish Parliament in Edinburgh on Monday evening.

Mark Runnacles via Getty Images Speakers addressed the crowd in Edinburgh, while protesters held signs reading "We stand together against hate."

Mark Runnacles via Getty Images Protesters chanted, “Say it loud, say it clear, refugees are welcome here” and “resist, revoke, stop Donald Trump," Severin Carrell of The Guardian reported

Matthew Horwood via Getty Images There were several protests in Wales.

Matthew Horwood via Getty Images The largest of them took place in Cardiff, where demonstrators gathered on Queen Street.