Over 5000 small banks have come out to voice opposition to the anti-gambling bill in the Senate. The bill would require these banks to block payments from US residents to online casinos. It's a poorly thought out piece of legislation, because it requires the banks to do all the enforcement work on their end, and their back-ends are not set up to do this.
The online casino industry is a $12 billion a year industry, and about $6 billion of that comes from US players.
Wall Street Journal