How would Texas' controversial SB4 immigration law work?

3 April 2024ByBernd Debusmann Jr,BBC News, WashingtonGetty ImagesA controversial Texas law that is the focus of an intense legal battle could soon become one of the toughest immigration measures in any US state.The law, known as SB4, would allow local and state police to arrest and prosecute undocumented migrants - upending US immigration enforcement. Texas Governor Greg Abbott signed it into law last year, but court rulings have stopped Texas from enforcing it. SB4 has been harshly criticised by the Biden administration and rights groups. The law "will not only make communities in Texas less safe, it will also burden law enforcement, and sow chaos and confusion at our southern border", White House Press Secretary Karine Jean-Pierre said in a statement.But Mr Abbott and Republican lawmakers have argued that Texas has a legal right to defend against the rising number of migrants, and the Texas governor has frequently alleged that President Joe Biden has failed to secure the US southern...