Today the Supreme Court granted certiorari in Arizona v. San Francisco. The case involves the Trump administration’s regulations on the “public charge” provision of the Immigration & Nationality Act.
The grant is limited to Question 1 of the petition, which involves Arizona’s and other states’ attempt to intervene in litigation challenging the regulations: “Whether States with interests should be permitted to intervene to defend a rule when the United States ceases to defend.”
You can find the cert-stage briefing—and follow the merits briefs as they come in—at SCOTUSblog and at the Supreme Court website.