Of course it's not in the news much. No Leftist narrative to be helped by shining light on it. Reporting it would remind people that (1) lots of Muslims are not peaceful people, they want all non-Muslims converted or dead, and (2) we have a serious problem with illegal immigration, one which is being abetted by the Biden Administration, Democrats and to a certain extent, Neocons (like George W. Bush, ironically). While many liberals will deny that criminals come across the Mexican border, I think they really don't believe that and honestly just figure it's the price to be paid in order to achieve their Utopia, much as gun owners like myself hate school shootings but we figure that's the price to be paid for having a Second Amendment. Of course, we have a Constitutional right to gun ownership while foreigners have no right at all to just waltz into our country unchallenged, which is an important distinction.
On a somewhat related note, if that had been somebody out to assassinate Trump instead of Bush, I'm pretty sure the FBI wouldn't have done jack shit.