Monmouth (4-4, 2-0 Metro-Atlantic) led by 13 in the first half, but Iona (4-3, 0-1) chipped away and went ahead 85-82 after Isaiah Williams' 3-pointer. Deon Jones followed with a layup, then hit two free throws to grab the lead back. After Schadrac Casimir missed a 3-pointer, Robinson sank a jumper to make it 88-85 with 33 seconds left.
Jones had 18 points and Max DiLeo added 12 for the Hawks, who shot 52.4 percent.
English finished with 31 points and Casimir hit eight 3-pointers to total 29 for the Gaels.