An influx of migrants at the US-Mexico border is stretching resources beyond capacity. December border crossings reached a record monthly high, prompting some mayors to issue an urgent call for action. US Border Patrol revealed immigration officials processed more than 300,000 migrants along the southern border in December. Republican Senator Lindsay Graham proposed to ship large numbers of migrants back to their home country in an effort to discourage others from entering the United States. This new year, immigration is expected to remain a pressing issue, both in Congress and during the presidential race to the White House.