The new vaccine rules.

I’m Isaac Saul, and this is Tangle: an independent, ad-free, subscriber-supported politics newsletter that summarizes the best arguments from across the political spectrum — then “my take.”

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Today’s read: 12 minutes.

We’re covering the Biden administration’s new vaccine rules and answering a reader question about a potential Covid-19 treatment.

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Quick hits.

1. House Democrats are expected to propose raising the corporate tax rate from 21 percent to 26.5 percent, and a 3-percentage point surtax on individual income above $5 million. (The plan)

2. The FBI released a newly declassified document on its investigation into the 9/11 attacks detailing contacts between the hijackers and several Saudi officials. (The release)

3. Sen. Joe Manchin (D-WV) once again said he won’t vote for Biden’s $3.5 trillion spending plan in its current form, proposing the cost be slashed by $2 trillion. (The nix)

4. Secretary of State Antony Blinken will testify twice before Congress this week on the withdrawal from Afghanistan. (The grilling)

5. North Korea said it fired new long-range cruise missiles in a test over the weekend. (The test)

Our “Quick hits” section is presented in partnership with Ground News, an app and website that rates the political bias in news coverage.

Today’s topic.

Vaccine mandates. On Thursday, President Joe Biden announced a new slate of federal vaccine requirements that could impact as many as 100 million Americans. The new rules impose different mandates for both private and federal employees. All employers with more than 100 workers (which covers roughly 80 million Americans) will be required to either test their employees for the virus weekly or mandate vaccination. Employers violating the new rules could face penalties of up to $14,000 per violation. Employers must provide paid time off to employees to be vaccinated.

Meanwhile, with limited exceptions, all federal employees and contractors must