President Donald Trump ordered a pause to the Diversity Visa lottery this week following the shootings that killed two Brown University students and an MIT professor and wounded others.Homeland Security Secretary Kristi Noem said she told USCIS to suspend processing at Trump’s direction, calling the suspect Claudio Neves Valente “a heinous individual,” while investigators say Neves Valente entered earlier on a student visa, later won a Diversity Visa, became a lawful permanent resident, was found dead of an apparently self-inflicted gunshot wound and authorities warned the pause will face legal challenges.