Question

Who has the power to declare war and approve treaties?

Answer 1

The president : Donald Trump

"The Constitution provides that the president "shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two-thirds of the Senators present concur" (Article II, section 2)."

https://www.senate.gov/artandhistory/history/common/briefing/Treaties.htm

Hope this helps