This is practically ancient history at this point, but it's been several weeks since Cassidy Hutchinson's testimony about Trump's meltdown on January 6th, and despite anonymous - sorry, confidential sources telling the media that the story wasn't true and that the Secret Service agents involved were eager to testify and deny it all, no such testimony has materialized, and the Secret Service as a whole seem to have nothing more to say on the subject. This is only conjecture on my part, of course, but I believe that they wouldn't have had a problem testifying if the story were false. I suspect that either the Secret Service's leadership doesn't want to put their agents in the position of essentially "telling on" the president, or the agents themselves are refusing to testify out of (understandable) fears of angering the MAGA hordes, especially after seeing how Hutchinson had to go into hiding after her testimony.