![CIUDAD JUAREZ, MEXICO - MARCH 16: (SECOND IN SERIES) Asylum seekers wade into the Rio Grande while crossing from Mexico into the United States on March 16, 2021 from Ciudad Juarez, Mexico. An unidentified young woman and girl walked through the shallow but strong current into El Paso to present themselves U.S. Border Patrol agents. A surge of immigrant families and as many as 13,000 unaccompanied minors now in U.S. custody, according to CBS News, is causing a humanitarian crisis at the U.S.-Mexico border. (Photo by John Moore/Getty Images)](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/LGY5KWEY4UY2LWMUE6DVFOXUN4.jpg?smart=true&auth=c31a1d9d5ad183f9cf5f2192284de800fd1ed7baae011ede1a97cef7c1460156&width=400&height=225)
Three Yemenis and one Serbian were detained by Customs and Border Protection agents on the US southern border. Getty
Three Yemenis and one Serbian were detained by Customs and Border Protection agents on the US southern border. Getty
Three Yemenis on FBI terror list attempt to cross southern US border
Republicans are highlighting the arrests as part of their attacks on President Joe Biden’s immigration policies