Many people will protest against President Donald Trump in the U.S. There will be a big march in Philadelphia. This is happening while the President is at a military parade in Washington to celebrate the Army's 250th birthday. People are also protesting because immigrants have been arrested and because the President sent soldiers to Los Angeles, where some protests have become violent. The police are using tear gas and other things to control the crowds. Soldiers are also going to different states to help the police. They say they will not allow any violence or breaking of laws. A group called the 50501 Movement is organizing these protests. They want to stop what they think are unfair actions by the Trump government. The protest in Philadelphia is expected to be the biggest one-day protest since Trump became president again. There will be events in almost 2000 places across the country.