President Biden plans to announce a program Tuesday to shield a half-million undocumented immigrants married to US citizens from deportation and provide a path to citizenship for many of them. Undocumented spouses who meet certain conditions, such as having been married for at least 10 years, would be offered work permits under the executive action, NBC News reports. The program is slated to be one of the largest immigration initiatives in decades, per the Wall Street Journal. “This is the biggest thing since DACA,” said an immigration advocate. The application process is to begin by the end o…