We already know the answer to that one: MONEY!
Sure, it’ll further destabilize the Middle East, not to mention violating American law, but those Arabs have money!!! How is anyone with the kind of ethical code that allows them to work for Donald Trump gonna turn down money?
The Washington Post Editorial Board:
… If the new gift to the crown prince is allowed to stand, Mr. Trump will have established a new precedent: Presidents may sell arms anywhere in the world without congressional review simply by claiming an unspecified emergency. Even supporters of Mr. Trump and of arms sales to Saudi Arabia ought to be troubled by this. Sen. James E. Risch (R-Idaho), the chairman of the Foreign Relations Committee, is at least thinking about it: In a statement, he said he was “reviewing and analyzing the legal justification for this action and the associated implications.”
Mr. Risch has a ready remedy: He can allow a vote in his committee on legislation to block the sales until the Saudi regime stops bombings in Yemen and meets other basic conditions, including the release of women’s rights activists it has detained and tortured. Congress has an obligation to rein in Mr. Trump’s wanton embrace of the Saudi strongman; it also must defend its basic foreign policy prerogatives. It’s time for Mr. Risch to show whether he is up to that challenge.
Mr. Risch is a Republican. The only ‘challenge’ he can see is whether he’ll fold fast enough & enthusiastically enough to please his Dear Leader…