Democrats are threatening to block a bill needed to avert an Oct. 1 US government shutdown unless Republicans agree to stop a sharp spike in Obamacare health insurance premiums or meet other demands by the minority party.

Bill Cassidy and Thom Tillis, who both voted to confirm Kennedy as HHS secretary, questioned his handling of the CDC.

The House is expected to vote on the bill this week, but success is not guaranteed.

The measure passed with a vote of 52 to 48 in the evenly divided chamber.

"It's no secret that we preferred to start over," McConnell said of Republican efforts repeal and replace Obamacare.

Republicans are already on shaky ground before the mid-term elections, and the loss of one of the most popular parts of the ACA might be a death knell.

Alaska Senator Lisa Murkowskis decision to agree late Tuesday to smash Obamacares individual mandate may remove one obstacle to passing the Senate Republican tax bill next week.

Senate Republicans gave up on their last-ditch proposal to repeal Obamacare Tuesday as opposition in their own ranks ended months of fruitless efforts to gut the Affordable Care Act.