Bipartisan U.S. Senate talks on a border security deal that some have set as a condition for further aid to Ukraine have hit a critical point, lawmakers said Thursday, with a top Republican saying a "plan B" may be needed to provide more aid for U.S. allies including Israel. A small group of senators has spent months trying to iron out an agreement to address the flow of migrants across the U.S.-Mexico border. But the effort has recently encountered growing opposition among Republicans aligned with Donald Trump, the frontrunner for their party’s presidential nomination.
