Alan Dershowitz’s imagination versus the Constitution

“The Constitution,” Alan Dershowitz claims, “allocates to the president sole authority over foreign policy (short of declaring war or signing a treaty).”
Dershowitz makes that claim by way of defending US president Donald Trump against conviction in the Senate on two articles of impeachment.
More specifically, he disputes the Government Accountability Office’s claim that Trump violated the law when he used pending foreign aid to extort Ukraine’s president into