What body has the power to ratify treaties?

The President has the power to make treaties, but they are not valid until 2/3 of the Senate ratifies them.

http://en.wikipedia.org/wiki/President_of_the_United_States#Powers

thank you so much. im trying to do this constitution packet and im struggling big time. im going to keep posting questions if you would like to help. i would GREATLY appreciate it.

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