Axios

The Justice Department said Friday it will not criminally enforce a 1968 federal law barring licensed gun dealers from selling handguns to 18- to 20-year-olds, after its Office of Legal Counsel concluded the restriction violated the Second Amendment.

Why it matters: The Trump administration is telling federal prosecutors not to enforce a law passed by Congress, even though the Supreme Court has never ruled on its constitutionality.

President Trump said late Friday the U.S. has struck a deal with Denmark that will give America "permanent control over security" in Greenland.

Why it matters: Control over Greenland has been a fixation of Trump's for years and a wedge in U.S. relations with Europe.

The U.S. Postal Service has slowed down mail deliveries so much it's failing to meet even its lowered performance targets, a new report from the Government Accountability Office found.

Why it matters: The Postal Service is part of the connective tissue of American life: delivering prescription drugs and ballots, carrying government notices and bills, helping businesses reach customers across the country.

• Now its attempts to shore up its finances are disproportionately affecting rural communities.