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A group of US senators wants Congress' watchdog agency to investigate whether controls on humanitarian aid deliveries by Israel and other foreign governments violate US law, according to a letter seen by Reuters.

The six senators - Chris Van Hollen, Dick Durbin, Jeff Merkley, Bernie Sanders, Elizabeth Warren and Peter Welch - wrote to Gene Dodaro, the comptroller general, asking him to launch an investigation by the nonpartisan Government Accountability Office into the US government's implementation of laws regarding the delivery of humanitarian assistance.