From Jayson Stark:

The Yankees' "by Monday night" deadline came and went. And Johan Santana was still a Twin when Tuesday arrived at the winter meetings. But even though the Yankees and Twins were still talking about different combinations as the night grew later and later, there was no indication that they were any closer to a deal for Santana than they were four days ago. In fact, if anything, the momentum seemed to be in the opposite direction. Officials from other clubs said several of the Yankees' baseball personnel at the meetings had begun openly questioning whether they even wanted to make this trade if the Twins said yes. "The more this goes on," said one AL executive, "the less they want to do it."

Via Ben.