Donald Trump was wrong to use Edwin Jackson's death to push his political agenda ... so says one of Jackson's closest friends, who says POTUS needs to focus on the REAL issue -- drunk driving.
We spoke with Minnesota Vikings LB Antwione Williams -- who was Jackson's college roommate at Georgia Southern. The two have been good friends for years.
Williams says it made him "sick" to see Trump using Jackson's death as a rallying cry for his immigration policy ... since the guy who allegedly killed Jackson was living in the U.