It seems that due to congressional concerns that, among other things, U.S. funds might be diverted to Palestinian terrorist groups, a report was researched and issued that asserts this aid is mostly subject to a host of vetting and oversight requirements and legislative restrictions. The problem is will there be PA stability.
How much money was and is involved? Well
Since the signing of the Oslo Accord in 1993 and the establishment of limited Palestinian self-rule in the West Bank and Gaza Strip in 1994, the U.S. government has committed over $3.5 billion in bilateral assistance to the Palestinians. Since the death of Yasser Arafat in November 2004, U.S. assistance to the Palestinians has been averaging about $400 million a year.
A lot of cash.
A full or partial U.S. aid cutoff could happen if Hamas is included in the government and does not change its stance toward Israel. Even if the immediate objectives of U.S. assistance programs for the Palestinians are met, lack of progress toward a politically legitimate and peaceful two-state solution could undermine the utility of U.S. aid in helping the Palestinians become more cohesive, stable, and self-reliant over the long term.