Americans in more than 130 cities took to the streets Saturday in a “March for Truth,” aimed at forcing an independent investigation of President Donald Trump and the ties between Russia and his campaign and associates.

Demonstrations were taking place in New York, Washington, D.C., Philadelphia, Boston and San Francisco, as well as in smaller cities across the country. Other cities around the world, including London, Brussels and Munich, were planning their own protests in solidarity.

“We are a coalition of grassroots organizers and organizations that are united in our demand for an impartial investigation into Russian interference in the 2016 election and ties to Donald Trump and his associates,” the organizers wrote on their website.

In Washington, the event will be held as a rally rather than a March, and there are plans to take an aerial photograph of the crowd forming the words ‘Investigate Trump,” according to The Washington Post.

At least 5,000 people were expected to join the Washington event, which began at 11.00 a.m. Eastern. The New York event started at 9.00 a.m. Eastern at Foley Square with a march long Broadway. Actress and talk show host Rosie O’Donnell, who has been trolled by Trump for years, is expected to speak, according to the paper.

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The protests come ahead of testimony by former Federal Bureau of Investigation Director James Comey to the Senate Intelligence Committee scheduled for Thursday, June 8 at 10 a.m. Eastern.

Comey, who was fired by President Donald Trump, will be presenting his side of the story to senators in both an open and a closed session.

The topic before the Senate Intelligence Committee is “Russian Federation efforts to interfere in the 2016 elections,” and the big topic will be whether — and more likely, how — Comey says Trump pressured him to drop the investigation into Trump campaign ties to Russian interference.

After the turmoil of Comey’s firing, former FBI Director Robert Mueller was named special counsel to oversee the investigation into ties between Trump’s campaign and Russian officials.

Meanwhile, a “Pittsburgh, not Paris” rally planned for Washington Saturday, failed to draw more than a dozen attendees, according to media reports. Trump himself did not attend the event, which was organized by supporters of his decision to pull the U.S. out of the Paris Climate Accord.