There is no basis in international law for the planned Israeli annexation of Palestinian territory.
The US political establishment understands that the USA was constructed on the annexation of the land of the Native Americans, the Mexicans, and the blood of the Africans, all with the aim of establishing a White settler republic.
They cannot justify the annexation—knowing full well that it is illegal—but are terrified that there might be actions taken against the Israeli government by the USA and other governments.
While they certainly have little to fear from Trump, who has gone out of his way to encourage the annexation, it is true that there is a growing awareness in Congress, and within the US public, that annexation is wrong.
Why should the people of the world continue to take a pass each and every time that Israel breaks international law?