US President Donald Trump (R) and US First Lady Melania Trump (L) step off Air Force One upon their arrival at Chopin Airport in Warsaw,on July 5, 2017. Donald Trump arrived for high-stakes visit to Europe on July 5, landing in Poland ahead of his first G20 summit in Hamburg and a closely-watched meeting with Russian President Vladimir Putin. (WOJTEK RADWANSKI/AFP/Getty Images)
WOJTEK RADWANSKI/AFP/Getty Images
US President Donald Trump (R) and US First Lady Melania Trump (L) step off Air Force One upon their arrival at Chopin Airport in Warsaw,on July 5, 2017. Donald Trump arrived for high-stakes visit to Europe on July 5, landing in Poland ahead of his first G20 summit in Hamburg and a closely-watched meeting with Russian President Vladimir Putin. (WOJTEK RADWANSKI/AFP/Getty Images)
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Leaders of the world's top economies gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / POOL / Michael Kappeler        (Photo credit should read MICHAEL KAPPELER/AFP/Getty Images)
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Story highlights

Donald and Melania Trump traveled to Hamburg Thursday ahead of the G20 summit

Activists have planned days of demonstrations to protest the G20 summit

(CNN) —  

First lady Melania Trump is unable to leave her Hamburg hotel and attend events with other G20 spouses because of protests, her spokeswoman said Friday.

“Hamburg police couldn’t provide clearance for us to leave,” Stephanie Grisham told reporters in Hamburg.

The spouses of G20 leaders are scheduled to tour a climate change center in Hamburg and take a river cruise while the world leaders attend the summit, according to media reports.

Donald and Melania Trump traveled to Hamburg Thursday ahead of the G20 summit, which kicked off Friday morning. Trump is scheduled to meet with Russian President Vladimir Putin and other world leaders during the day.

Activists have planned days of demonstrations to protest the G20 summit. Protesters in the anti-capitalist Welcome to Hell march clashed with police Thursday afternoon and into the night. Police used water cannons on the crowd and protesters threw bottles and smoke bombs.

Melania Trump tweeted about the protests Friday, saying she was “Thinking of those hurt in #Hamburg protests. Hope everyone stay safe! #G20”