Department of Homeland Security Secretary Kristi Noem unveiled a multimillion-dollar ad campaign warning immigrants in the U.S. illegally to either self-deport or risk being deported and not being allowed to come back again. President Trump has sought to crack down on illegal immigration, looking to slash the number of crossings at the southern border and following through with deportations, particularly of immigrants who have been convicted of crimes. In the ad set to run internationally, Noem