Donald Trump posted on Truth Social connecting the killings of Rob Reiner and Michele Singer Reiner in their Brentwood home to what he called "TRUMP DERANGEMENT SYNDROME," and he refused to retract the comment when asked in the Oval Office.The Los Angeles Police Department has arrested the couple's son, Nick Reiner, who is being held on $4 million bail and whom the LAPD says is responsible while investigators continue to probe a motive amid reports he struggled with addiction and mental health issues.The post and a separate lawsuit in which Trump seeks at least $5 billion from the BBC provoked rare bipartisan rebukes from Republicans including Mike Lawler, Stephanie Bice, Marjorie Taylor Greene, Thomas Massie and Don Bacon, and analysts said the backlash reflects shifting calculations inside the Republican Party that could affect 2026 strategy.