It's a bold last-ditch effort to overturn the results in the U.S. Senate race between Sen. Bob Casey (D-PA) and his Republican challenger David McCormick, who is up by about 21,000 votes, a lead unlikely to be reversed by a simple recount.

A number of progressive Jewish groups are backing an effort by Sen. Bernie Sanders to block arms sales to Israel. The effort, a collection of several resolutions, is unlikely to pass in the closely divided Senate but could split Democratic lawmakers.

The U.S. Senate is due to vote on Wednesday on legislation that would block arms sales to Israel, backed by lawmakers who say Israel is obstructing aid shipments desperately needed by Palestinian civilians in Gaza.

"This war has been conducted almost entirely with American weapons and $18 billion in U.S. taxpayer dollars. Israel has dropped U.S.-provided 2,000-pound bombs into crowded neighb