A couple of days ago, Hamas leader Mahmoud Zahar's said that Hamas would welcome Mahmoud Abbas to visit Gaza, but the only problem is that they could not adequately protect him from being assassinated by his fellow Fatah members (the ones who follow Mahmoud Dahlan.)
Fatah leaders in Gaza, of course, dispute that.
Dr. Abdullah Abu Samhadana, a senior leader of Fatah in Gaza, says that Hamas is the party that is preventing such a visit, and that Fatah supports it, saying that it would help bring about that unity we've been hearing so much about.
Yes, the "unified" Fatah and Hamas are fighting over which of them is acting against unity.