Israel has temporarily withheld payments in the past, too, but has always paid when circumstances allowed. Palestinians are obligated to renounce terrorism and accept the existence of Israel, but have now brought a terror organization into their government. When this problem is fixed, Israel will return the money.
Hamas' Khaled Meshal met with Saeb Erekat in Qatar (Haaretz)
from the article: The robbery is going off without a hitch