C# Instant OnTriggerEnter Detection

Is there a way to make an OnTriggerEnter detect gameobjects as soon as they are in the trigger collider? I have a gameobject that upon start has it's position equal the trigger collider's position. But the script for the trigger collider never executes. Any idea why the OnTriggerEnter function never executes? I need to use OnTriggerEnter so other gameobjects can pass through the collider.

 using UnityEngine;
 using System.Collections;
 
 public class OnTriggerTransformPositionScript : MonoBehaviour {
     public GameObject OnTriggerGameobject;
     // Use this for initialization
     void Start () {
         gameObject.transform.position = OnTriggerGameobject.transform.position;
     }
 }

 using UnityEngine;
 using System.Collections;
 
 public class OnTriggerScript : MonoBehaviour {
     
     void OnTriggerEnter (Collider cols) {
         Debug.Log("A Gameobject is within Trigger Collider");
     }
 }