Republicans want to pair border security with aid for Ukraine. Here's why that makes a deal so tough

FILE - Migrants who crossed into the U.S. from Mexico are met with concertina wire along the Rio Grande, Sept. 21, 2023, in Eagle Pass, Texas. As Congress returns this week, Senate Republicans have made it clear they won’t support additional war aid for Ukraine unless they can pair it with border security measures. (AP Photo/Eric Gay, File)

WASHINGTON (AP) — As Congress returns to session this week, lawmakers will be trying to forge an agreement on sending a new round of wartime assistance to Ukraine. But to succeed, they will have to find agreement on an issue that has confounded them for decades.

Republicans in both chambers of Congress have made clear that they will not support additional aid for Ukraine unless it is paired with to help manage the influx of migrants at the U.S.-Mexico border. Their demand has injected one of the most contentious issues in American politics into a foreign policy debate that was already difficult.

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