A key question is whether the Biden administration can bind the U.S. to treaties and agreements without the consent of the Senate, which is required under the Constitution.
The zero draft states that, per international law, treaties between countries must be ratified by national legislatures, but the draft also includes a clause that the deal will go into effect on a "provisional" basis, as soon as it is signed by delegates to the WHO, and therefore it will be legally binding on members without being ratified by legislatures.
Republican lawmakers are attempting to revive the attempt to take the U.S. out of the WHO, which former President Donald Trump did, but President Joe Biden reversed upon entering the White House.