Question

Presidents often make ___________________ with leaders of other nations because doing so does not require the approval of the Senate.
A. informal treaties
B. presidential deals
C. recognition accords
D. executive agreements

Answer 1

In the western world, presidents often make "informal treaties" with leaders of other nations because doing so does not require the approval of the Senate, although these are often more difficult to enforce. 

Answer 2

D. Executive agreements