The 9th Circuit Court of Appeals upheld a lower court's earlier injunction on Friday, temporarily stopping the Trump administration from enforcing the Migrant Protection Protocols (MPP) — known as the "Remain in Mexico" policy.

Why it matters: Tens of thousands of migrants seeking asylum have been forced to wait out their U.S. immigration court cases across the border in Mexico under the policy. The Trump administration has long credited this program for the decline in border crossings following record highs last summer.

The Justice Department wants to dramatically increase fees for immigrants trying to fight deportation— including nearly $1,000 to appeal an immigration judge decision, according to a proposed Executive Office for Immigration Review rule.

Between the lines: It currently costs around $100 for immigrants to begin to legally fight deportation orders. If implemented, the new rule would raise fees to at least $305 and as much as $975, depending on the appeal.

The 2nd U.S. Circuit Court of Appeals ruled Wednesday that the Trump administration can withhold millions of dollars in federal law enforcement grants from sanctuary cities and states that don't cooperate with immigration enforcement, AP reports.

The state of play: Seven states and New York City sued the U.S. government after the Justice Department said in 2017 it would withhold funds from cities and states that don't give immigration enforcement officials access to jails or notice when an undocumented migrant is scheduled to be released from jail, per AP.

On Tuesday, the Supreme Court ruled 5-4, along ideological lines, that the family of a Mexican teenager who was killed across the southern border by a U.S. border agent cannot sue for damages.

Why it matters: The court’s decision avoids inviting more lawsuits from foreign nationals against U.S. law enforcement. The court noted in its opinion that “a cross-border shooting claim has foreign relations and national security implications.”

Effective Monday, the U.S. will begin blocking more foreigners from obtaining green cards and some visas based on the Trump administration's guesses about what kind of people they'll become and whether they may ever burden taxpayers.

Why it matters: The long-expected "public charge" rule effectively creates a wealth and health test, which could keep hundreds of thousands of people from making the U.S. their legal home.

U.S. Supreme Court Justice Sonia Sotomayor issued a dissenting opinion on Friday against the court's 5-4 vote to allow the Trump administration to penalize immigrants likely to rely on public programs like food stamps and Medicaid.

The big picture: The Trump administration has consistently tried to get controversial cases in front of the Supreme Court as quickly as possible, routinely asking the high court to step in before appeals courts have a chance to rule, Axios' Sam Baker reports. Sotomayor is apparently expressing her dissent at this new arrangement as well as the ruling itself.

Greyhound said it will stop allowing Border Patrol agents without a warrant to board its buses to conduct routine immigration checks, AP reports.

What they're saying: The company said it'll notify the Department of Homeland Security that it does not consent to unwarranted searches on its buses or in areas of terminals that are not open to the public.

Today's Nevada caucus will foreshadow the future of American politics well beyond 2020.

Why it matters: The U.S. is in the midst of a demographic transformation, and the country's future looks a lot like Nevada's present. Today's results, in addition to shaping the 2020 race, will help tell us where politics is headed in a rapidly changing country.

Immigration is projected to drive most population growth in the United States by 2030, and cutting immigration levels will do little to alter the nation's coming racial and ethnic transformation, according to a new Census Bureau study on population projections.

Why it matters: A growing population will be essential to the U.S.'s long-term economic growth.