(Portland, OR) -- Mayor Ted Wheeler is among hundreds of people who took to downtown Portland last night for protests against police brutality and systemic racism. Wheeler was at times confronted and booed by the crowd as he criticized the deployment of federal officers to the city. Wheeler called the federal presence an unconstitutional occupation, with unidentified agents arresting people without probable cause, denying them their basic rights. At one point, Wheeler was tear gassed along with the crowd. The federal agents are part of President Trump's efforts to quell ongoing protests sparked by the police killing of George Floyd in Minneapolis in late May.