That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

"Behaviors take time to implement and adopt. They also take time to un-adopt," says Abraar Karan, an internal medicine physician at Brigham and Women's Hospital.