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Four Senate Republicans — Ted Cruz, Mike Lee, Rand Paul, and Ron Johnson — just released a statement saying they're "not ready to vote for" the Senate health care bill. That's enough to kill the bill if they actually vote against it. "It does not appear this draft as written will accomplish the most important promise that we made to Americans: to repeal Obamacare and lower their healthcare costs," they wrote.

The bottom line: If a rebellion happens, it's largely because conservatives want to get rid of more of the Affordable Care Act's insurance regulations. And that's a big part of the Republican dilemma. Conservative Republicans say those rules make individual health insurance more expensive, and they're right — but the most expensive regulations are the ones that protect people with pre-existing conditions, which is exactly what Senate Republicans don't want to get rid of.

Deeper dive: The draft Senate bill would let states escape some of the ACA's "Title I" insurance regulations, like minimum benefit requirements — but not the pre-existing condition protections, like requiring insurers to cover sick people and preventing them from charging those consumers higher rates. According to an analysis circulated by Sen. Bill Cassidy, prepared by the consulting firm Oliver Wyman, that's what added the most to individual insurance costs.

Here's what Cruz said earlier this week: "There is no doubt there has got to be significant reform to reduce the burdens from the Title I insurance mandates. Why? Because they're one of the principal drivers of premiums skyrocketing."

For context: Sen. Rand Paul said today that it's more than just the regulations — it's also the fact that the Senate bill keeps the ACA subsidies in a scaled-back form: "It doesn't fix the death spiral in Obamacare, it simply subsidizes it with taxpayer money to insurance companies."

What the House bill does: It allows states to waive the pricing rules for sick people under certain conditions. The Senate bill doesn't go that far.

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Pence no longer expected at Amy Coney Barrett's final confirmation vote

Photo: Ben Hasty/MediaNews Group/Reading Eagle via Getty Images

Vice President Mike Pence no longer plans to attend the Senate's final confirmation vote for Judge Amy Coney Barrett on Monday, following Senate Democrats' claims that his presence after possible exposure to the coronavirus would be a "violation of common decency," a Pence aide confirmed to CNN and Politico on Monday.

Driving the news: Five of Pence's aides were recently diagnosed with COVID-19, including his chief of staff, who is currently quarantining. Pence has continued his campaign travel despite his possible exposure, which goes against CDC guidelines.