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The 2,000-mile frontier has become a symbol in American politics as the debate over immigration grows increasingly polarized.

Seeking asylum has become the surest way for migrants to stay in the U.S. The underfunded immigration system can’t keep up, so cases languish for years.

According to Customs and Border Protection, federal agents were “physically barred” by state officials from responding to the situation. Texas officials said that was “wholly inaccurate.”