The Utah judge in the murder case of Charlie Kirk’s killing has denied a defense request to force Tyler Robinson’s former roommate to testify in person during the preliminary hearing. Judge Tony Graf said Monday that the credibility of any testimony can be challenged later if the case goes to trial. Graf also postponed a ruling on whether prosecutors could face sanctions for comments to the media about a bullet fragment recovered from the conservative activist’s body until Friday. Robinson has not yet entered a plea. The 23-year-old from southwestern Utah is charged with aggravated murder in the Sept. 10 assassination of Kirk. The ally of President Donald Trump was shot in the neck while addressing a crowd of thousands at Utah Valley University.