Answer:
President Lyndon B. Johnson
Explanation:
In early August 1964, two U.S. destroyers stationed in the Gulf of Tonkin in Vietnam radioed that they had been fired upon by North Vietnamese forces. In response to these reported incidents, President Lyndon B. Johnson requested permission from the U.S. Congress to increase the U.S. military presence in Indochina.
(Source: https://history.state.gov)
*NOT MY ANSWER* Taken from the site written above!
