YouTube suspended President Trump’s channel on Tuesday night, joining a climbing list of tech companies that are ejecting him from their platforms.The Alphabet Inc. video-sharing service announced it was suspending Mr. Trump’s channel for at least a week after the company got rid of videos that violated its policies in opposition to content it believes could fuel violence.YouTube’s move follows similar decisions from Facebook Inc. and Twitter Inc. On Thursday, Facebook suspended Mr. Trump’s account indefinitely and on Friday, Twitter locked Mr. Trump’s personal account.While the companies took action based on various pieces of content, the posts and videos appeared to reiterate unsupported claims that the election was stolen and expressed support for the pro-Trump mob that attacked the US Capitol last week.