Calvinists reject the idea that God bases His divine election on His foreknowledge of people, as well as the idea that God has given men free will. One tactic used to refute these concepts is to try to confuse the issue:
“For example, before the foundation of the world, God knew that Joe would make a free decision to become a Christian. Somehow, then, before Joe was born, God knew of his free decision. So even at that time, Joe’s free decision must have been inevitable. Why was it inevitable? Not because of Joe’s free will, for Joe was not yet born. Not because of God’s predestination, because the Arminian denies that possibility from the outset. It would seem that the inevitability in question had some source other than either Joe or God.”
Excerpt From Apologetics to the Glory of God by John Frame pp. 44-45 (P & R Publishing)