This is from a DuckDuckGo search and there are literally 50 pages of stories about people accusing Trump of collusion. Here is a start of the stories, just an abbreviated version. I could do this all day but I've got work to do.
https://www.breitbart.com/entertainment/2019/03/25/flashback-50-hollywood-stars-who-accused-trump-of-treason-collusion-with-russia/
https://lidblog.com/democrats-treason/
https://www.nbcnews.com/news/us-news/did-donald-trump-commit-treason-n618941
https://www.cnn.com/2019/09/23/politics/gop-primary-bill-weld-mark-sanford-joe-walsh-trump/index.html
https://news.grabien.com/story-11-times-dems-media-accused-trump-administration-treason
https://www.independent.co.uk/news/people/donald-trump-guilty-treason-four-ways-electoral-college-intelligence-russian-election-hacking-a7484751.html
https://www.newsweek.com/did-trump-commit-treason-putin-meeting-heres-what-lawyers-say-1027643
https://thehill.com/homenews/house/397456-hoyer-trump-committed-treason-in-helsinki
https://www.msnbc.com/the-last-word/watch/did-donald-trump-commit-treason-846182979794
https://www.palmerreport.com/analysis/treason-right-trump-donald-committed/18728/
https://dailycaller.com/2019/03/29/hill-democrats-media/
https://www.bostonglobe.com/opinion/2018/07/16/donald-trump-committing-treason/IwvTjJW4rvDdZD1vhvYMlI/story.html
https://www.indy100.com/article/conservative-historian-donald-trump-treason-accusation-7643461
https://www.romper.com/p/has-trump-committed-treason-this-one-tweet-has-the-internet-up-in-arms-27953
https://www.independent.co.uk/news/world/americas/donald-trump-us-congressman-ted-lieu-treason-russia-links-shutdown-us-president-legislation-agenda-a7647651.html
https://www.wyselaw.com/index.php/2018/01/23/has-president-trump-committed-treason-probably-not/
https://dailycaller.com/2016/12/30/liberals-accuse-trump-of-treason/
https://www.mediaite.com/tv/john-brennan-stands-very-much-by-trump-treason-claim-on-meet-the-press-i-dont-think-im-being-political/
https://www.alternet.org/2019/01/paul-krugman-trump-loyalists-know-he-committed-treason-with-putin-but-its-an-ok-price-for-the-racism/